Odgovornost postoji, osim ako je prtljag već oštećen.

Osim ako means unless.

Literally, it is made from:

• osim = except
• ako = if

So the structure is basically except if, which in natural English is usually unless.

Serbian does not have articles like a and the.

So odgovornost can mean:

• responsibility
• the responsibility
• sometimes even liability, depending on context

You understand whether it is definite or general from the situation, not from an article.

Odgovornost is in the nominative singular.

It is the subject of the verb postoji:

• Odgovornost postoji = Liability exists / There is liability

Also, odgovornost is a feminine noun. Many Serbian nouns ending in -ost are feminine.

Postoji comes from postojati, meaning to exist.

So Odgovornost postoji sounds like:

• Liability exists
• There is liability
• Responsibility applies

This is especially natural in formal, legal, or administrative language. If you used je, you would usually need something after it, such as a description:

• Odgovornost je ograničena = Liability is limited

Grammatically, prtljag is singular.

Even though English luggage or baggage refers to multiple items, Serbian treats prtljag as a singular mass/collective noun. That is why the sentence has:

• je = singular is
• oštećen = masculine singular form

This is about Serbian word order, especially clitics.

Je is a short form of biti and behaves like a clitic. Clitics usually come very early in the clause, often in second position.

So after ako, you often get:

• ako je prtljag već oštećen

A more straightforward word order is also possible:

• ako je prtljag već oštećen
• ako je već oštećen prtljag is possible but less neutral
• ako je prtljag oštećen is also normal

The version in your sentence is standard and natural.

Oštećen means damaged.

It agrees with prtljag, which is:

• masculine
• singular

So the form must also be masculine singular:

• oštećen

Compare:

• prtljag → oštećen
• torba = bag, feminine → oštećena
• koferče = small suitcase, neuter → oštećeno

It is originally a past passive participle, but in sentences like this it functions very much like an adjective.

So je oštećen means is damaged. It describes the state of the luggage, not mainly the action that caused the damage.

That is why it feels closer to:

• the luggage is damaged than to
• the luggage was damaged by someone

Već means already.

It shows that the luggage was in that state before the situation being discussed. So the exception applies if the luggage was damaged beforehand.

Its position is fairly flexible, but here it naturally goes before oštećen:

• je prtljag već oštećen

Yes. Serbian word order is more flexible than English, although not completely free.

For example, you could also hear:

• Odgovornost postoji, osim ako je već oštećen prtljag.
• Odgovornost postoji, osim ako je prtljag oštećen.

But the original:

• Odgovornost postoji, osim ako je prtljag već oštećen.

is a very neutral and natural version.

The comma separates the main clause from the subordinate clause.

Main clause:

• Odgovornost postoji

Subordinate clause:

• osim ako je prtljag već oštećen

In formal writing, especially in legal or administrative style, this comma is standard and expected.