A vendedora mostrou um anel bonito e uma pulseira que combinavam com o vestido.

Portuguese usually uses the definite article more often than English does. So a vendedora literally means the saleswoman.

In many situations, Portuguese prefers:

• a vendedora
• o rapaz
• a menina

where English might simply say:

• the saleswoman
• or sometimes even just saleswoman in a more general context

Here, a vendedora is the natural way to say the saleswoman.

Mostrou comes from the verb mostrar, meaning to show.

Here it is in the simple past (also called the preterite in Portuguese):

• eu mostrei = I showed
• você/ele/ela mostrou = you/he/she showed

So A vendedora mostrou... means The saleswoman showed...

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

Because Portuguese nouns have grammatical gender.

• anel is masculine, so it takes um
• pulseira is feminine, so it takes uma

So:

• um anel = a ring
• uma pulseira = a bracelet

This gender also affects adjectives and other words that agree with the noun.

Because bonito is describing anel, which is masculine.

• um anel bonito = a beautiful ring
• uma pulseira bonita = a beautiful bracelet

In this sentence, bonito comes right after anel, so the most natural reading is that only the ring is being directly described as beautiful.

Grammatically, bonito most directly describes only anel.

So the sentence most naturally means:

• a beautiful ring and a bracelet that matched the dress

If the speaker wanted beautiful to clearly describe both items, they would usually say something like:

• um anel e uma pulseira bonitos
• or um anel bonito e uma pulseira bonita

Because anel and pulseira have different genders, repeating the adjective is often the clearest option.

Because combinavam is plural, and it refers to both items:

• um anel
• uma pulseira

Together, those two things are plural, so the verb in the relative clause becomes plural too:

• que combinavam com o vestido = that matched the dress

So the idea is:

• the ring and the bracelet matched the dress

If it referred to only one item, then singular would be used:

• um anel que combinava com o vestido = a ring that matched the dress

Here que means that or which.

It introduces a relative clause:

• uma pulseira que combinavam com o vestido

Even though que comes right after pulseira, the verb combinavam shows that the clause refers back to um anel bonito e uma pulseira together.

So que is connecting the noun phrase to extra information:

• the ring and the bracelet, which matched the dress

That is normal in Portuguese. The relative clause often comes after the second item in a coordination, even when it refers to the whole group.

So:

• um anel bonito e uma pulseira que combinavam com o vestido

can still mean:

• a beautiful ring and a bracelet that matched the dress

The plural verb combinavam is what tells you the clause applies to both the ring and the bracelet, not just the bracelet.

Combinar com means to match or to go well with.

Examples:

• Essa bolsa combina com o sapato. = That bag matches the shoe.
• Azul combina com branco. = Blue goes well with white.

In your sentence:

• combinavam com o vestido = matched the dress

This is a very common expression when talking about clothes, colors, accessories, or style.

Com o vestido means with the dress or, more naturally here, matched the dress.

It is made of:

• com = with
• o vestido = the dress

Portuguese often uses the article where English does too, and often even where English might omit it. Here o vestido is the normal form.

So:

• combinar com o vestido = to match the dress

Yes. Vendedora is feminine and refers to a woman.

• vendedor = salesman / male salesperson
• vendedora = saleswoman / female salesperson

In modern English, salesperson is often more neutral, but Portuguese still commonly marks gender in nouns like this.

Yes. Since learners often notice some possible ambiguity, a clearer version could be:

• A vendedora mostrou um anel bonito e uma pulseira; os dois combinavam com o vestido.
• A vendedora mostrou um anel bonito e uma pulseira que combinavam ambos com o vestido.
• A vendedora mostrou um anel e uma pulseira que combinavam com o vestido.

The original sentence is grammatical, and the plural combinavam already strongly suggests both items matched the dress. But Portuguese sometimes allows structures that feel slightly less explicit than what an English learner expects.