Mesmo depois do fim do relacionamento, a amizade pode continuar.

Here mesmo adds emphasis. In mesmo depois de..., it means something like even in English.

So Mesmo depois do fim do relacionamento... means even after the end of the relationship...

By itself, mesmo can have other meanings too, such as same, self, or really/exactly, but in this sentence its job is to strengthen depois.

Because Portuguese usually contracts de + o into do.

So:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

That is why you get:

• depois do fim = after the end

Using depois de o fim would sound unnatural in normal Portuguese.

They come from two different combinations:

1. depois de + o fim → depois do fim
2. fim de + o relacionamento → fim do relacionamento

So the structure is:

• depois do fim = after the end
• do relacionamento = of the relationship

It may look repetitive, but it is completely normal in Portuguese.

Portuguese often uses noun phrases where English might prefer a clause.

So instead of saying something like after the relationship ended, Portuguese naturally says:

• depois do fim do relacionamento
• literally: after the end of the relationship

This kind of structure is very common and sounds natural in formal and neutral Portuguese.

Yes, relação is possible in some contexts, but relacionamento is especially common when talking about a romantic relationship.

Compare:

• relacionamento = relationship, often romantic
• relação = relation/relationship, but broader and sometimes less specifically romantic

In Brazilian Portuguese, fim do relacionamento sounds very natural for the end of the relationship between a couple.

Portuguese uses definite articles more often than English.

Here a amizade means the friendship, but in natural English we might simply say friendship.

In this sentence, a amizade refers to the friendship between those people, or to friendship as a specific continuing bond after the relationship ends.

So the article is normal and expected in Portuguese.

Pode continuar means can continue or may continue, so it expresses possibility, not certainty.

• a amizade continua = the friendship continues
• a amizade pode continuar = the friendship can continue / may continue

So this sentence does not say friendship definitely continues in every case. It says that it is possible.

Because poder works like a modal verb, similar to can in English.

Structure:

• pode + infinitive
• can + base verb

Examples:

• pode continuar = can continue
• pode acontecer = can happen
• pode mudar = can change

So continuar stays in the infinitive because it depends on pode.

Yes, it is natural and standard here because the sentence begins with a longer introductory phrase:

• Mesmo depois do fim do relacionamento, ...

That opening part sets the time/context before the main clause:

• a amizade pode continuar

In shorter speech, people may not think much about the comma, but in writing it is the normal choice.

Yes. That version is also correct and natural.

The difference is mainly focus:

• Mesmo depois do fim do relacionamento, a amizade pode continuar.
  This highlights even after the relationship ends.

• A amizade pode continuar mesmo depois do fim do relacionamento.
  This starts with the friendship can continue and adds the time phrase afterward.

Both are good; the original version gives a little more emphasis to the surprising idea that the friendship survives after the breakup.

Yes. Após o fim do relacionamento is correct and means the same thing.

The difference is style:

• depois de/depois do = very common, neutral, everyday
• após = a bit more formal or written

So:

• Mesmo depois do fim do relacionamento... = very natural and common
• Mesmo após o fim do relacionamento... = slightly more formal

Usually, yes. O fim do relacionamento strongly suggests that a romantic relationship has ended.

Depending on context, it does not necessarily mean a dramatic breakup; it simply means the relationship is over. The sentence then says that friendship may still remain afterward.

The structure is:

• Mesmo depois do fim do relacionamento = introductory time/context phrase
• a amizade = subject
• pode continuar = verb phrase

So the core sentence is:

• A amizade pode continuar. = The friendship can continue.

Everything before the comma adds the circumstance:

• Even after the relationship ends / after the end of the relationship