Lesson 42: Advanced Sentence Relationships: Coordination, Subordination & Embedding

Introduction

Lesson 41 unpacked dense sentences built on nominalization and compression. Today's lesson tackles a different kind of density: a sentence that is long not because it's compressed, but because it contains several clauses stacked, chained, and folded inside one another. Learning to see instantly which clause is the main one, which are merely supporting it, and which are embedded inside another clause entirely is one of the most valuable skills in advanced English reading — it's the difference between reading a fifty-word sentence word by word and reading it as a single, clearly structured idea.

What Is a Clause?

The basic unit: a subject plus a finite verb

A clause is a grammatical unit that normally contains a subject and a finite verb. The system works is one clause. The system works because it reduces errors contains two: the system works and it reduces errors — but the two do not carry equal importance, and recognizing that inequality is this entire lesson's starting point.

Coordination vs. Subordination

Equal units, or a main idea plus a supporting one?

Coordination joins two equal units: the system is fast, and it is reliable joins two independent clauses of equal grammatical status. Subordination joins a main clause to a dependent one: the system is reliable because it is carefully tested has a main clause (the system is reliable) and a subordinate clause (because it is carefully tested) that cannot stand alone as a complete sentence.

Coordination and subordination produce different shapes

1Coordination: Clause A + and/but/or/so + Clause B (equal weight)

2Subordination: Main Clause ← supported by → Subordinate Clause

This distinction matters because an author uses it to build an information hierarchy. The company changed its billing system because the old system was inefficient makes the company changed its billing system the main information and the old system was inefficient the supporting reason. Treating every clause in a sentence as equally important — reading straight through without sorting main from supporting — is exactly what slows comprehension down on long, real-world sentences.

Coordinating Connectors, and a Trap Inside Them

'And' does not always join two clauses

The four coordinating connectors — and (addition), or (alternative), but (contrast), so (result) — are deceptively simple, because and in particular often joins something smaller than a clause. The system is fast and reliable joins two adjectives. The system processes invoices and generates reports joins two verb phrases sharing one subject. Only when a second subject appears — the manager reviewed the data, and the director approved the report — is and actually joining two independent clauses. Always check what comes after and before assuming a new clause has started. But works differently: the system is efficient, but it is expensive always joins two full, equally weighted propositions.

Subordinators and Clause Position

A subordinate clause can move to either side of the main clause

Common subordinators include because, although, even though, if, unless, when, while, after, before, since, once, whereas, even if. Although the system is expensive, the company adopted it and the company adopted it although the system is expensive mean exactly the same thing — only the position of the subordinate clause has changed.

A comma often marks the boundary in the first pattern, but punctuation alone is not a reliable method for finding where one clause ends and another begins. The reliable method is always the same: find the subject and the finite verb.

Finding the Finite Verb

The single most powerful tool for decoding a long sentence

A finite verb carries a real grammatical relationship to tense, person, and number — implemented, has implemented, will implement are all finite. Two traps to watch for: an -ing form is not automatically a main verb (the company implemented a system reducing processing time — main verb implemented; reducing is a participle, short for that reduces), and neither is a past participle (the system designed for large organizations was expensive — main verb was; designed introduces a reduced relative clause, short for that was designed).

Once you can reliably spot finite verbs, a sentence with several of them reveals its own hierarchy. The researchers found that the system performed better because it reduced errors has three finite verbs — found, performed, reduced — arranged as: main clause (the researchers found X) → complement clause (that the system performed better) → reason clause (because it reduced errors).

Embedding: A Clause Inside Another Clause

One grammatical unit tucked inside another

Embedding happens when one clause sits inside another, doing a grammatical job for it. I know that the system works embeds that the system works as the object/complement of know — the whole clause is playing the role a single noun normally would.

Noun Complement Clause vs. Relative Clause

Both use 'that' — but they answer completely different questions

Noun complement clause: the claim that the system improves efficiency — the that-clause states the content of the claim. Ask "what is the claim?" and the answer is the whole clause: the system improves efficiency. Relative clause: the system that improves efficiency — the that-clause identifies which system is meant. Ask "which system?" and the answer is: the one that improves efficiency.

The same pattern recurs constantly: evidence that automation reduces errors (content — what does the evidence show?) vs. evidence that was collected during the study (identification — which evidence?). Confusing these two is a genuinely common source of misreading in academic prose.

Three Roles of "That"

Demonstrative, complementizer, or relative pronoun — context decides

That system is expensive — demonstrative, meaning "that one, over there." Researchers believe that the system works — complementizer, simply introducing a noun complement clause. The system that we tested performed well — relative pronoun, part of a relative clause identifying which system. The surrounding pattern tells you which: believe + that-clause is a complementizer; noun + that

clause referring back to the noun is usually relative.

Noun + That-Clause and Adjective + That-Clause

Two extremely common academic frames

Noun + that: the possibility that the system may fail, the assumption that employees will accept the change, the fact that costs increased, the evidence that the policy was effective, the claim that automation improves productivity — in every case, the noun names the kind of proposition, and the that-clause supplies its actual content.

It + adjective + that: it is clear that the system has improved; it is likely that costs will increase; it is possible that the results are misleading. Here it is a dummy subject (extraposition) — the real proposition is the that-clause, moved to the end of the sentence for balance.

Verb + That-Clause

The backbone pattern of reported academic claims

Researchers found that…, studies suggest that…, evidence indicates that…, analysts argue that…, experts believe that…, the report concludes that… — every one of these follows verb + that + proposition, and every one of them is an attribution, exactly as Lesson 34 and Lesson 41 discussed: the claim inside the that-clause belongs to the named source, not automatically to the author writing the sentence.

Embedded Questions

Whether, how, and why can turn a whole question into one clause

Researchers asked whether the system was reliable embeds the question is the system reliable? as whether the system was reliable. Researchers examined how the system reduced errors embeds how did the system reduce errors? as how the system reduced errors. Whether deserves special attention: the researchers investigated whether automation reduced costs embeds a yes/no question whose answer the sentence itself does not give.

Whether, why, and how feeding directly into a main verb

Question of whether: the question of whether automation is effective reduces to whether automation is effective — question of is simply framing. Depend on whether: the outcome may depend on whether employees accept the new system — main claim outcome may depend on X, where X is whether employees accept the new system. Explain why: the study explains why the system failed. Examine how: researchers examined how employees used the technology. All four patterns fold an entire question into the grammatical slot a single noun would normally occupy.

A Nested Embedding, Fully Decoded

A genuinely dense sentence, taken apart piece by piece

The researchers concluded that the system, which had been tested under controlled conditions, performed better than expected because it reduced errors without increasing processing time.

Finite verbs: concluded, had been tested, performed, reduced. Main clause: the researchers concluded X. Complement clause (what was concluded): that the system performed better than expected. Relative clause (describing the system, nested inside the complement clause): which had been tested under controlled conditions. Comparative phrase: better than expected — better than what researchers expected. Reason clause: because it reduced errors — explaining why it performed better. Without + V-ing: without increasing processing time — a negative accompanying condition attached to the reason clause.

The full architecture of that sentence, layer by layer

1MAIN CLAUSE — The researchers concluded

2→ COMPLEMENT CLAUSE — that the system performed better than expected

3→ → RELATIVE CLAUSE — which had been tested under controlled conditions

4→ → REASON CLAUSE — because it reduced errors

5→ → → WITHOUT + V-ING — without increasing processing time

Reading Trick: Remove the Layers, Then Restore Them

Read the skeleton first — the details will still be there afterward

Take the same sentence and strip it down in stages. Remove the relative clause: the researchers concluded that the system performed better than expected because it reduced errors without increasing processing time. Remove the reason clause too: the researchers concluded that the system performed better than expected. Now you have the skeleton — researchers concluded X; X = system performed better than expected — and every layer you removed can be added back in, one at a time, without ever losing track of what the sentence's main move actually is.

A Step-by-Step Clause Decoding Method

Working through any long sentence, one clause at a time

1Underline every finite verb

2Find the subject that goes with each finite verb

3Identify the main clause

4Bracket the subordinate clauses

5Identify any embedded clauses inside those

6Read the skeleton — subject, main verb, and its complement — on its own

7Restore the details, one layer at a time

Two More Worked Clause Trees

Practicing the method on two shorter sentences

The company reported that costs had fallen after the new system was introduced. Main: the company reported X. Complement: that costs had fallen. Time clause, nested inside the complement: after the new system was introduced.

Although employees initially resisted the system, managers found that it improved productivity because it reduced repetitive tasks. Concession: although employees initially resisted the system. Main: managers found X. Complement: that it improved productivity. Reason, nested inside the complement: because it reduced repetitive tasks. Main message: managers found that productivity improved — the resistance and the reason are both supporting information, not the sentence's central claim.

Information Hierarchy: Not Every Clause Carries Equal Weight

The clause at the front of the sentence is rarely the main point

Although the system was initially criticized by several employees because of concerns about reliability, the company decided to continue using it. Main: the company decided to continue using it. Secondary: the system was initially criticized. Background/reason: concerns about reliability. Reading for main → supporting → background, rather than treating every clause as equally weighted, is what makes long sentences readable at speed rather than merely readable at all.

The Main Clause Is Usually the Author's Own Move

Watch for the verb that names what the author is actually doing

Academic writing signals its own central move through main verbs like reports, argues, suggests, concludes, demonstrates, emphasizes. Although previous studies have produced mixed results, the authors argue that the evidence supports the proposed explanation — the author's real move is argue that…; the previous studies are background, positioned first but not primary.

The "Although" Trap and the "Because" Trap

The clause that comes first is not automatically the main point

Learners often assume the opening clause of Although X, Y is the main point, when it's almost always the reverse: Y is the main proposition, X is the concession. Although costs increased, the company expanded the project — the main point is that the company expanded, not that costs increased. The same trap runs the other direction with because: the company expanded because demand increased has the same logical relationship as because demand increased, the company expanded — only the position changed, and in both, the company expanded is the main clause.

Multi-Role Connectors: Since, While, and As

Three connectors whose meaning depends entirely on context

Since means time (since 2020, the company has expanded — from 2020 onward) or reason (since demand increased, the company expanded — because demand increased). While means time (while the system was running, engineers monitored it) or contrast (while the system is efficient, it is expensive). As carries at least four meanings: reason (as demand increased, prices rose = because), time (as the system started, employees entered their data = when), manner (the system works as expected = in the way expected), and role/status (he works as a consultant = in the role of). None of these three words has one fixed meaning — the surrounding sentence always decides.

Despite vs. Although, Because vs. Because Of

Same logical relationship, different grammatical company

Although takes a full clause: although the system was expensive, the company adopted it. Despite takes a noun phrase or a V-ing form, never a full clause: despite the high cost, the company adopted it; despite being expensive, the system was adopted. The same split applies to cause: because takes a clause (because the system failed), while because of takes a noun phrase (because of the system failure). Grammatically different, but functionally the same relationship — read although and despite as the same concession, and because and because of as the same reason.

Coordination vs. Subordination — Final Comparison

Feature	Coordination	Subordination
Relationship	equal	hierarchical
Common words	and, but, or, so	because, although, if, when
Main clause	both sides can stand alone	only one main clause
Information hierarchy	relatively equal	main + supporting
Pattern	A, and B	A because B

A Fully Worked Advanced Sentence

Coordination, concession, complement, and reason all in one sentence

The company introduced a centralized logistics platform, and although some employees initially resisted the change, managers reported that it significantly improved coordination because information could be shared more quickly.

Finite verbs: introduced, resisted, reported, improved, could be shared. Clause 1 (coordinated with and): the company introduced a centralized logistics platform. Clause 2: opens with a concession — although some employees initially resisted the change — then its own main clause, managers reported X, where X is the complement that it significantly improved coordination, itself followed by a reason clause, because information could be shared more quickly.

What each connector is doing, named explicitly

And = coordination. Although = concession. That = complement clause. Because = reason. Could = possibility/capability. More quickly = comparison. Six small words, six distinct logical jobs, inside one 30-word sentence.

Stripped to a skeleton: the company introduced a platform, and managers reported that it improved coordination — or further still, two bare propositions: company introduced platform; managers reported improvement. The full information hierarchy then reads: main action (company introduced the platform) → report (managers reported) → main reported claim (platform improved coordination) → reason (information could be shared faster) → concession (some employees initially resisted). That is information architecture, not just grammar.

A Master Clause-Decoding Framework

The complete sequence for any long, multi-clause sentence

1Find every finite verb

2Find each finite verb's subject

3Identify the main clause

4Identify coordination — equal units joined by and/but/or/so

5Identify subordination — a main clause plus a dependent one

6Identify embedded clauses — complement, relative, or question clauses folded inside another

7Remove the supporting layers and read the core message

8Restore the details, one layer at a time

9Check the logical relationship each connector actually signals

Vocabulary in Context

coordinationnountechnical

joining two grammatically equal units, such as two independent clauses, with and/but/or/so (সমন্বয়)

Often with coordination of clauses, coordinate clause, coordination with 'and'

“'The vessel arrived and the crew disembarked' uses coordination, joining two equal clauses with 'and'.”

subordinationnountechnical

joining a main clause to a dependent clause that cannot stand alone, using words like because/although/when (অধীনতা)

Often with subordinate clause, use subordination, subordination of

“'Although the vessel arrived late, the crew disembarked' uses subordination to make one clause depend on the other.”

finite verbnoun phrasetechnical

a verb form marked for tense, person, and number, capable of being the main verb of a clause (নির্দিষ্ট ক্রিয়াপদ)

Often with main finite verb, identify the finite verb, non-finite form

“In 'The manager who approved the plan resigned', the finite verb of the main clause is 'resigned'.”

embedverbtechnical

to place one grammatical unit, such as a clause, inside another so it functions as part of the larger structure (অন্তর্ভুক্ত করা)

Often with embed a clause, deeply embedded, embedded within

“The writer embedded a relative clause inside the main clause, making the sentence longer but still grammatical.”

complement clausenoun phrasetechnical

a that-clause stating the content of a preceding noun or verb, rather than identifying which one is meant (পরিপূরক বাক্যাংশ)

Often with that-complement clause, complement clause after a noun, complement clause with 'that'

“In 'The claim that costs fell is false', the words 'that costs fell' form a complement clause.”

embedded questionnoun phrasetechnical

a question folded into a clause using whether/how/why, functioning as a noun within a larger sentence (অন্তর্ভুক্ত প্রশ্ন)

Often with form an embedded question, embedded question word order, use an embedded question

“'The audit asked how the error had occurred' contains an embedded question with statement word order.”

concessionnounformal

a clause that acknowledges an opposing or limiting point before the sentence's main claim (স্বীকারোক্তি)

Often with concessive clause, make a concession, concession before the main claim

“In 'Although the cost is high, the benefits are clear', the first clause makes a concession.”

skeletonnountechnical

the bare main clause of a sentence, with all subordinate and relative clauses temporarily removed (মূল কাঠামো)

Often with sentence skeleton, bare skeleton, strip down to the skeleton

“Stripped to its skeleton, the sentence says only that the committee approved the budget.”

Guided Reading Practice

Read this passage once for its overall meaning, then go back and mark every finite verb, every coordinator, and every subordinator before checking your reading against the notes that follow.

Although the terminal had already introduced automated gate processing, congestion during peak hours remained a persistent problem, and managers eventually concluded that the bottleneck was not the gates themselves but the yard-planning system, which had not been updated since the terminal's cargo volume had roughly doubled. Once the planning system was redesigned, congestion fell noticeably, although a small number of peak-hour delays continued to occur.

The passage opens with a concession (although…automated gate processing) before its first main clause (congestion…remained a persistent problem), coordinated by and with a second main clause (managers…concluded that…). That complement clause contains its own internal contrast (not X but Y) and a relative clause (which had not been updated) that itself contains a time clause (since the terminal's cargo volume had roughly doubled). Once introduces a time-based subordinate clause for the final sentence, whose own main clause (congestion fell noticeably) is followed by one more concession (although a small number…continued). Five layers of clause relationships, one continuous idea.

Golden Rule

Before reading a long sentence for meaning, find every finite verb and its subject first — the main clause is always among them, and everything else is either coordinating with it or supporting it.

Lesson Summary

This lesson gave you the architecture underneath everything Lesson 41 practised unpacking: coordination joins equal units, subordination builds a main-plus-supporting hierarchy, and embedding folds one clause entirely inside another — as the content of a noun (the claim that…), the identity of a noun (the system that…), or an embedded question (whether/how/why…). You practised finding finite verbs first, distinguishing a noun complement clause from a relative clause, catching the although and because trap, and reading multi-role connectors like since, while, and as by context rather than by a single fixed translation.

The sequence to run on any resistant sentence

Find the finite verbs. Find their subjects. Identify the main clause. Bracket everything coordinating or subordinate to it. Remove the layers and read the skeleton. Restore the details one at a time. A sentence that looked like fifty unmanageable words becomes: main idea → supporting idea → explanation → qualification → evidence.

Practice: Test What You've Learned

Work through every question yourself before checking anything.

Before you start

For each sentence, underline every finite verb before you attempt to answer — resist the temptation to guess the main clause from the sentence's opening words alone, since concessions and background clauses very often come first.

Part A — Coordination and Its Traps

The manager reviewed the data and approved the report. Explain why this is not an example of two coordinated independent clauses, and rewrite it so that it is.
Show answer
There is only one subject, "the manager," shared by both verbs "reviewed" and "approved," so "and" here joins two verb phrases, not two independent clauses. Rewritten with a second subject, it becomes coordination: The manager reviewed the data, and the director approved the report.
The system is efficient, but it is expensive. Identify the two full propositions joined here, and explain what "but" signals about their relationship.
Show answer
The two propositions are "the system is efficient" and "it is expensive," each a complete clause with its own subject and finite verb. "But" signals contrast, presenting the second proposition as working against the positive expectation set up by the first, without cancelling either claim.

Part B — Finite Verbs and Main Clauses

The system designed for large organizations was expensive. Identify the sentence's one finite main verb, and explain why "designed" is not a second main verb.
Show answer
The one finite main verb is "was." "Designed" is a past participle introducing a reduced relative clause, short for "that was designed for large organizations," so it describes "the system" rather than carrying its own tense as a second main verb.
The researchers found that the system performed better because it reduced errors. List all three finite verbs and identify which clause is the main one.
Show answer
The three finite verbs are found, performed, and reduced. The main clause is "the researchers found X," with "that the system performed better" as its complement clause and "because it reduced errors" as a reason clause nested inside that complement.

Part C — Complement Clauses vs. Relative Clauses

The evidence that automation reduces errors was presented at the conference. Is the that-clause here a complement clause or a relative clause? Justify your answer.
Show answer
It is a complement clause. Asking "what is the evidence?" is answered by the whole clause, "automation reduces errors," which states the content of the evidence rather than identifying which evidence among several is meant.
The evidence that was collected during the study was presented at the conference. Explain how this sentence differs in structure from question 5, despite the surface similarity.
Show answer
Here "that was collected during the study" is a relative clause identifying which evidence is meant, answerable by "which evidence?" rather than stating the evidence's content. In question 5 the that-clause names what the evidence shows; here it only picks out the evidence's source, without saying what it demonstrates.

Part D — Embedded Questions and Multi-Role Connectors

Researchers investigated whether automation reduced costs. Rewrite the embedded question as a direct question, and explain what the embedded form allows the sentence to do that the direct form cannot.
Show answer
Direct question: Did automation reduce costs? The embedded form folds that question into the object slot of "investigated," letting the sentence report that the question was asked and studied without itself asserting or revealing the answer — something a standalone direct question cannot do inside a larger statement.
While the system is efficient, it is expensive. Explain which of "while's" two meanings applies here, and how you know.
Show answer
"While" signals contrast here, not time. Efficiency and expense are not two events happening simultaneously in time; the sentence is setting one quality against another, the same relationship "although" or "whereas" would express.
As demand increased, prices rose. Identify which of "as's" four possible meanings applies here.
Show answer
"As" carries the meaning of reason here, equivalent to "because" — rising demand is presented as the cause of rising prices, not merely as something happening at the same time.

Part E — Full Sentence Architecture

Return to this lesson's guided reading passage about the terminal's automated gate processing.

Identify the sentence's main clause following "although the terminal had already introduced automated gate processing."
Show answer
The main clause is "congestion during peak hours remained a persistent problem," which is itself coordinated with a second main clause, "managers eventually concluded that the bottleneck was not the gates themselves but the yard-planning system."
Explain what the relative clause "which had not been updated since the terminal's cargo volume had roughly doubled" is describing, and identify the time clause nested inside it.
Show answer
The relative clause describes "the yard-planning system," identifying it as the system that had gone without an update. Nested inside it is the time clause "since the terminal's cargo volume had roughly doubled," which explains how long that gap has lasted rather than adding a separate main event.
Using the master clause-decoding framework from this lesson, reduce the passage's final sentence to its skeleton, then restore its two concessions one at a time.
Show answer
Skeleton: congestion fell noticeably. First restoration: once the planning system was redesigned, congestion fell noticeably. Second restoration, adding the closing concession: once the planning system was redesigned, congestion fell noticeably, although a small number of peak-hour delays continued to occur.
Explain why treating the opening "although" clause as the passage's main point would misread the entire paragraph.
Show answer
An opening "although" clause is a concession, not the main claim — exactly the "although trap" this lesson warns about. Treating "the terminal had already introduced automated gate processing" as the main point would miss that the passage's real message is that congestion persisted despite that technology, and was only resolved by fixing the yard-planning system.

With coordination, subordination, and embedding now mapped explicitly, you have the structural skeleton behind everything this course has taught about dense sentences — the tool that turns an intimidating 50-to-60-word academic sentence into a main idea supported by clearly ranked layers of detail.