A seguradora realmente reembolsou o cliente.

Seguradora means insurance company or insurer.

In this sentence, A seguradora is most naturally understood as the insurance company. In everyday Portuguese, this is a very common way to refer to the company itself.

So:

• seguradora = insurer / insurance company
• A seguradora = the insurer / the insurance company

Because seguradora is the usual feminine noun for an insurance company.

A few useful points:

• a seguradora = the insurance company
• o segurador can exist, but it is not the normal everyday way to refer to the company in a sentence like this
• the feminine article a does not mean the company is female; it just matches the grammatical gender of the noun seguradora

So here, A seguradora is simply the standard form.

In Portuguese, nouns ending in -e are not automatically masculine or feminine. You have to learn the gender of each noun.

With cliente, the article shows the gender:

• o cliente = the male client / the client
• a cliente = the female client

So in your sentence, o cliente means either:

• a male client specifically, or
• a client referred to with masculine grammatical gender

Reembolsou is the pretérito perfeito simples (simple past / preterite) of reembolsar.

It means:

• he reimbursed
• she reimbursed
• it reimbursed

Here, because the subject is A seguradora, the meaning is:

• The insurance company reimbursed...

This tense is used for a completed action in the past.

So A seguradora realmente reembolsou o cliente means that the reimbursement actually happened and is viewed as finished.

Because in this sentence o cliente is the direct object of reembolsou.

Portuguese can use reembolsar in a structure like:

• reembolsar alguém = to reimburse someone

So:

• A seguradora reembolsou o cliente = The insurance company reimbursed the client

You may also see other patterns, for example when the thing reimbursed is mentioned:

• A seguradora reembolsou as despesas ao cliente = The insurance company reimbursed the expenses to the client

So the structure changes depending on whether Portuguese focuses on:

• the person reimbursed, or
• the amount/expense reimbursed

Here realmente means really, actually, or indeed.

It adds emphasis and suggests something like:

• the reimbursement truly happened
• it was not just promised
• perhaps there was some doubt before

In this sentence, realmente is confirming the action:

• A seguradora realmente reembolsou o cliente = The insurance company really did reimburse the client

Sometimes yes, but the nuance changes a little.

• realmente = really / actually / indeed
• de facto = in fact / actually
• mesmo = really / indeed, often a bit more conversational or emphatic

Examples:

• A seguradora realmente reembolsou o cliente.
  Neutral and standard.

• A seguradora de facto reembolsou o cliente.
  More like the insurance company did in fact reimburse the client.

• A seguradora reembolsou mesmo o cliente.
  Stronger emphasis, often more conversational.

So realmente is a very good, natural choice here.

Because adverbs in Portuguese are fairly flexible, and this position is very natural.

In A seguradora realmente reembolsou o cliente, realmente sits between the subject and the verb, which is a common position for adverbs of this type.

This placement emphasizes the truth of the action:

• A seguradora realmente reembolsou o cliente.

Other placements are possible, for example:

• Realmente, a seguradora reembolsou o cliente.
• A seguradora reembolsou realmente o cliente.

But the original version sounds very natural and balanced.

Yes. Portuguese allows some flexibility, especially with adverbs like realmente.

For example:

• A seguradora realmente reembolsou o cliente.
• Realmente, a seguradora reembolsou o cliente.
• A seguradora reembolsou realmente o cliente.

All of these can express roughly the same basic idea, but the emphasis shifts slightly.

The original sentence is probably the most neutral and standard choice.

In European Portuguese, the direct object pronoun would be o, attached after the verb in an affirmative main clause:

• A seguradora realmente reembolsou-o. = The insurance company really reimbursed him/it.

This is a very important European Portuguese pattern:

• affirmative main clause: reembolsou-o
• with negation: não o reembolsou

So:

• A seguradora realmente reembolsou-o.
• A seguradora não o reembolsou.

That post-verbal pronoun placement is especially characteristic of European Portuguese.

Not exactly.

• reembolsar = to reimburse
• devolver = to return / give back

Reembolsar is specifically about paying money back, compensating an expense, or refunding a cost.

Devolver is broader and can be used for returning an object, money, or something received.

For example:

• A seguradora reembolsou o cliente.
  The insurer reimbursed the client.

• O cliente devolveu o produto.
  The client returned the product.

So reembolsar is the better verb when the idea is financial reimbursement.

Yes, it is perfectly natural and correct.

It sounds:

• standard
• clear
• slightly formal or neutral

That fits well with the topic of insurance and reimbursement, which is often discussed in more formal language anyway.

In more everyday speech, people might sometimes use other expressions depending on context, such as:

• A seguradora devolveu o dinheiro ao cliente.
• A seguradora fez o reembolso ao cliente.

But A seguradora realmente reembolsou o cliente is absolutely natural.

A rough English-style guide would be:

uh suh-goo-ruh-DOH-ruh rree-ahl-MEN-tuh rree-em-bol-SOH oo klee-EN-tuh

A few helpful pronunciation notes:

• seguradora: stress on do
• realmente: stress on men
• reembolsou: stress on the last syllable sou
• cliente: stress on en

Also, in European Portuguese:

• unstressed vowels are often reduced
• the r at the start of realmente and reembolsou is stronger than an English r
• final -e often sounds very weak

So if you want to sound more European Portuguese, try not to pronounce every vowel as fully as you would in English.