Dokle god mladoženja ostane miran, sve će ići bolje nego što očekuje.

Here dokle god means as long as or so long as. It introduces a condition that continues over time.

Yes, dok god is a very common shorter variant and would also sound natural here. On its own, dokle can mean something like until when or how far, but in the fixed expression dokle god, it simply means as long as.

Because some Croatian masculine nouns end in -a. Mladoženja is one of them.

So even though the ending may look feminine to an English speaker, the word is grammatically masculine. You can see that from miran, which is the masculine singular form and agrees with mladoženja.

In this sentence, mladoženja is the subject, so it is in the nominative singular.

Ostane is the present-tense form of the perfective verb ostati.

In Croatian, subordinate clauses introduced by words like dok, kad, ako, čim, and dok god/dokle god often use a present form even when the whole sentence refers to the future.

So:

Dokle god mladoženja ostane miran...
means As long as the groom remains/stays calm...

Using će ostati here would usually sound less natural. Ostaje would suggest a more ongoing or habitual idea, while ostane fits this future condition better.

Because miran is an adjective describing the subject mladoženja.

With verbs like biti, ostati, and postati, Croatian often uses an adjective that agrees with the subject:

• mladoženja = masculine singular
• miran = masculine singular

So ostane miran means remains calm.

Mirno would usually be an adverb meaning calmly, or a neuter adjective form, so it does not fit here.

Here sve means everything.

So sve će ići... literally means everything will go... In natural English, that often becomes something like everything will go better or things will go better.

Croatian often uses sve this way when talking about how a whole situation develops.

This is the standard Croatian future tense:

• će = the future auxiliary
• ići = to go

So sve će ići means everything will go.

The position of će is normal here. Croatian clitics like će usually come near the beginning of the clause, after the first word or phrase.

Because bolje is used adverbially here: it describes how things will go.

Compare:

• dobro = well
• bolje = better

So ići bolje means to go better.

Bolji is an adjective meaning better when it describes a noun, not the verb. That is why bolje is correct here.

Nego što introduces the comparison clause and means than in the sense of than what/how.

So bolje nego što očekuje means better than he expects.

A useful way to think about it is:

• nego often compares words or short phrases
• nego što often introduces a full clause

Because očekuje is a verb and a clause follows, nego što is very natural here.

Croatian often leaves subject pronouns unstated when they are clear from context. This is very normal.

Očekuje is a 3rd person singular form, so it can mean he expects, she expects, or sometimes it expects, depending on context.

In this sentence, the most natural reading is that it refers to the groom, since he is the main person mentioned. If you wanted to make that explicit, you could say nego što on očekuje.

The given word order is natural, but Croatian word order is fairly flexible.

For example, Dok god mladoženja ostane miran, sve će ići bolje... would also be natural. Changing the order can shift emphasis a little, but the basic meaning stays the same.

What does need to stay under control is clitic placement, especially with će, because Croatian clitics follow specific word-order rules.