Ana evaluează broșa autentică cu lupa.

Because Romanian usually puts the definite article at the end of the noun, not as a separate word before it.

• broșă = a brooch
• broșa = the brooch

So -a here is the feminine singular definite article attached to the noun.

For the same reason: Romanian normally uses an enclitic definite article, meaning the article is attached to the noun itself.

• lupă = a magnifying glass
• lupa = the magnifying glass

So instead of saying something like the brooch with a separate word, Romanian says broșa.

In Romanian, adjectives usually come after the noun.

So the normal order is:

• broșa autentică = the authentic brooch

Putting the adjective before the noun is possible, but it sounds more emphatic, stylistic, or literary:

• autentica broșă

Notice that when the adjective comes first, the definite article often shifts onto the adjective.

Because the adjective has to agree with the noun in gender and number.

Here, broșa is:

• feminine
• singular
• definite

So the adjective takes the feminine singular form:

• masculine singular: autentic
• feminine singular: autentică

That is why Romanian says broșa autentică, not broșa autentic.

Evaluează is the present tense, 3rd person singular form of a evalua.

So it matches a singular subject like:

• Ana
• el = he
• ea = she

In this sentence, Ana evaluează means Ana evaluates / is evaluating.

Romanian present tense often covers both simple present and present progressive meanings, depending on context.

Because Romanian often drops subject pronouns when they are not needed.

Here the subject is already clearly stated as Ana, so adding ea would usually be unnecessary.

• Ana evaluează broșa autentică cu lupa. = natural
• Ea evaluează broșa autentică cu lupa. = possible, but now she is the explicit subject
• Ana, ea evaluează... = usually only for emphasis or contrast

Romanian is much more comfortable than English with leaving pronouns out.

Here cu means with, and it introduces the instrument used to do the action.

So:

• cu lupa = with the magnifying glass

In other contexts, cu can also mean with in the sense of accompaniment:

• Ana vine cu Maria. = Ana comes with Maria.

But in your sentence, it clearly means using the magnifying glass.

Both are possible, but they mean slightly different things.

• cu lupa = with the magnifying glass
  This suggests a specific magnifying glass, or one already known from context.
• cu o lupă = with a magnifying glass
  This is indefinite and less specific.

So the sentence you have is using the definite form.

Yes. Romanian word order is more flexible than English word order.

The sentence as written:

• Ana evaluează broșa autentică cu lupa.

is a normal, neutral order.

But Romanian can move things around for emphasis or focus. For example:

• Ana evaluează cu lupa broșa autentică.
  This puts a little more focus on cu lupa.

The basic meaning stays similar, but the emphasis changes. English is usually stricter about word order than Romanian.

It can be a little ambiguous, just as English can be.

The most natural reading is:

• Ana is evaluating the authentic brooch using the magnifying glass.

But technically, someone could momentarily wonder whether it means:

• the authentic brooch with the magnifying glass

If you want to make the instrumental meaning clearer, Romanian can say:

• Ana evaluează broșa autentică folosind lupa.

If you really wanted with a magnifying glass as part of the brooch description, you would usually rephrase it more clearly.

The main things English speakers usually notice are these:

• ș in broșa = sh as in ship
• ă in autentică and evaluează = a short neutral vowel, like the a in about
• cu = roughly koo
• lupa = LOO-pa

A rough pronunciation of the whole sentence is:

AH-na eh-vah-loo-EH-zuh BRO-sha ow-TEN-ti-kuh koo LOO-pa

That is only an approximation, but it is a useful starting point.