После того как мы убрали старый диван, в комнате стало свободнее.

После того как is a fixed conjunction meaning after or after the fact that. It introduces a whole clause:

После того как мы убрали старый диван = After we removed the old sofa

If you use just после, it normally goes with a noun or noun phrase, not a full clause:

• после уборки = after the cleaning
• после ужина = after dinner

So here, because a full action is being introduced, после того как is the natural choice.

In this sentence, после того как works as one conjunction at the beginning of a subordinate clause:

После того как мы убрали старый диван

That whole clause comes before the main clause, so the comma is placed at the boundary between the two clauses:

После того как мы убрали старый диван, в комнате стало свободнее.

So the comma marks where the subordinate clause ends, not the inside of the conjunction.

Убрали is the perfective past tense of убрать. It shows the action was completed.

That fits this sentence, because the second part describes the result after the sofa was removed. The room became more spacious because the action was finished.

Compare:

• убрали = removed / took away completely, finished action
• убирали = were removing / used to remove / removed with focus on process or repeated action

Here the point is the completed result, so убрали is the right aspect.

Because диван is the direct object of убрали, and in an affirmative sentence a masculine inanimate noun usually has the same form in the accusative as in the nominative.

So:

• nominative: диван
• accusative: диван

If it were animate, the accusative would usually match the genitive instead.

For example:

• я вижу стол = I see a table
• я вижу брата = I see my brother

Since a sofa is inanimate, старый диван stays старый диван in the accusative.

The adjective старый has to agree with диван in gender, number, and case.

Here диван is:

• masculine
• singular
• accusative
• inanimate

For masculine inanimate nouns, the accusative form of the adjective looks the same as the nominative:

• nominative: старый диван
• accusative: старый диван

So the adjective matches the noun exactly as expected.

This is an impersonal construction. Russian often says things like:

• стало лучше = it became better
• стало холодно = it became cold
• стало свободнее = it became more spacious / there was more room

There is no explicit subject like English it. Russian simply uses the neuter singular past form стало as a kind of default form in this pattern.

So в комнате стало свободнее literally feels like:

In the room, it became more spacious

But in natural English, you would usually say:

The room became more spacious
or
There was more space in the room

Grammatically, свободнее is the comparative form of свободный / свободно.

Depending on context, свободнее can mean:

• freer
• less occupied
• less busy
• more spacious / less cramped

In this sentence, because we are talking about a room after removing a sofa, it means more spacious, roomier, or less cluttered.

So this is a good example of how a Russian comparative may need a more idiomatic English translation depending on context.

Because в with the prepositional case is used for location:

• в комнате = in the room

Here there is no movement into the room; it describes where the result is true. So Russian uses the prepositional case:

• комната = nominative
• в комнате = prepositional

If there were motion into the room, Russian would normally use the accusative:

• в комнату = into the room

Both are possible, but they are slightly different in feel.

• В комнате стало свободнее focuses on the situation in the room.
• Комната стала свободнее sounds more like the room itself became more spacious.

Russian often prefers the first type with an impersonal construction when describing a change in atmosphere, space, comfort, temperature, and so on.

So в комнате стало свободнее is very natural and idiomatic.

Yes. Russian word order is flexible, because case endings already show the grammatical relationships.

For example, you could also say:

В комнате стало свободнее после того как мы убрали старый диван.

This is still correct, but the focus shifts a bit:

• original: first the action, then the result
• reordered version: first the result, then the explanation

The original sentence is very natural because it presents the sequence clearly: first we removed the sofa, then the room felt more spacious.

Yes, Russian can sometimes omit personal pronouns when the verb form already makes the subject clear.

So Убрали старый диван can sometimes mean We removed the old sofa, depending on context.

But мы is often included when the speaker wants to:

• make the subject explicit
• add contrast or emphasis
• avoid ambiguity

In this sentence, мы simply makes it clear and straightforward: we were the ones who removed it.