Sud je donio odluku.

Je is the 3rd person singular present form of biti (to be), and here it is used as an auxiliary verb to form the Croatian perfect tense.

So:

• je donio = has brought / brought
• in natural English here: made / rendered a decision

Croatian often uses this tense where English simply uses the past:

• Sud je donio odluku. = The court made/rendered a decision.

Donijeti is the infinitive form, meaning to bring or, in this expression, to make/reach/render.

Donio is the past participle used with je to form the past tense:

• donijeti = infinitive
• je donio = brought / has brought

This participle also agrees with the subject in gender and number. Since sud is masculine singular, the form is donio.

Compare:

• Sud je donio odluku. = masculine singular
• Vlada je donijela odluku. = feminine singular

Because it is the direct object of the verb, so it has to be in the accusative case.

The noun is:

• odluka = nominative singular
• odluku = accusative singular

This is a very common pattern for feminine nouns ending in -a:

• knjiga → knjigu
• poruka → poruku
• odluka → odluku

So in Sud je donio odluku, odluku means a/the decision as the thing being made or rendered.

Yes. Donijeti odluku is a very common Croatian collocation meaning to make a decision, to reach a decision, or in legal contexts often to render a decision.

Literally, donijeti often means to bring, but in this expression you should learn it as a unit:

• donijeti odluku = make/reach/render a decision

So even though the literal meaning may feel odd in English, the phrase itself is completely normal Croatian.

Croatian does not have definite or indefinite articles like English the or a/an.

So:

• sud can mean court or the court
• odluku can mean a decision or the decision

The exact meaning depends on context.

If Croatian speakers want to be more specific, they can use other words such as demonstratives:

• taj sud = that court
• tu odluku = that decision

But in many sentences, no article is needed.

Donijeti is a perfective verb. That means it presents the action as completed.

In this sentence, that fits well because the court has completed the act of making or issuing the decision.

Its imperfective partner is donositi.

Compare:

• Sud je donio odluku. = the court completed the decision
• Sud je donosio odluke svaki tjedan. = the court was making / used to make decisions every week

So the sentence uses donijeti because it refers to one completed act.

Yes. Croatian word order is more flexible than English because case endings help show what each word is doing.

The neutral order here is:

• Sud je donio odluku.

But other orders are possible for emphasis, for example:

• Odluku je donio sud. = It was the court that made/rendered the decision.

Even when the order changes, the case form odluku still shows that it is the object.

So word order in Croatian often affects emphasis more than basic grammar.

Because je is a clitic, and Croatian clitics usually go in the second position in the sentence or clause.

So in:

• Sud je donio odluku

the first unit is Sud, and the clitic je comes right after it.

This second-position rule is very important in Croatian. That is why a learner should get used to seeing short forms like je, se, ga, mu, etc. near the beginning of the clause rather than wherever English would put them.

This is a good observation. The verb donijeti has a past participle form donio, which does not copy the whole infinitive shape exactly.

So you get:

• donijeti → donio
• feminine: donijela
• neuter: donijelo
• plural masculine: donijeli

This is normal for this verb family, even if it looks a bit unpredictable at first. It is best to learn the key forms together:

• donijeti = infinitive
• donio / donijela / donijelo = past participle forms

Here it is capitalized only because it is the first word of the sentence.

As a common noun, sud is normally written with a lowercase s:

• sud je donio odluku

But official institution names use capitals where appropriate, for example:

• Ustavni sud Republike Hrvatske

So in your sentence, the capital S is not because sud is automatically a proper noun; it is just sentence-initial capitalization.