Kažu da naša budućnost ovisi o tome kakve odluke donosimo danas, u sadašnjosti.

Kažu literally means they say, but in Croatian it is very often used impersonally, like English people say, it is said, or they say when no specific group is meant.

So here Kažu da... means something like:

• They say that...
• People say that...
• It is said that...

It does not necessarily mean a specific they.

Da introduces a subordinate clause, very often equivalent to English that.

So:

• Kažu da... = They say that...

In Croatian, da is extremely common after verbs of saying, thinking, knowing, wanting, etc.

In this sentence:

• Kažu da naša budućnost ovisi...
• They say that our future depends...

Naša budućnost means our future.

• naša = our
• budućnost = future

The form naša is used because budućnost is a feminine singular noun. Croatian possessive words like moj, tvoj, naš change form to agree with the noun they describe.

Examples:

• naš plan = our plan (masculine)
• naša budućnost = our future (feminine)
• naše selo = our village (neuter)

Ovisiti o means to depend on.

So:

• budućnost ovisi o... = the future depends on...

A very important point is that ovisiti normally goes with o + locative.

Examples:

• Ovisi o vremenu. = It depends on the weather.
• Sve ovisi o tebi. = Everything depends on you.

In your sentence:

• o tome = on that / on it

O tome is part of a very common Croatian pattern:

• ovisiti o tome što/kako/kakav...
• depend on what/how/what kind...

So the structure is:

• ovisi o tome kakve odluke donosimo danas
• literally: depends on that, what kind of decisions we make today
• natural English: depends on the decisions we make today or depends on what kind of decisions we make today

The phrase o tome works like a grammatical bridge. It is very natural in Croatian, even if English often leaves this extra word out.

Kakve means what kind of, what sort of, or which kind of.

So:

• kakve odluke = what kind of decisions

The word kakve agrees with odluke:

• odluke is feminine plural
• so kakav becomes kakve

This phrase emphasizes the quality or type of decisions, not just the fact that decisions are made.

Odluke is the accusative plural here, and for this noun it looks the same as the nominative plural.

That is because donositi takes a direct object:

• donosimo odluke = we make decisions

Basic forms:

• singular: odluka = decision
• plural: odluke = decisions

So in the sentence:

• kakve odluke donosimo = what kind of decisions we make

Yes, literally donositi often means to bring, but in the expression donositi odluke, it means to make decisions.

This is just a standard Croatian collocation:

• donijeti odluku = to make a decision / to reach a decision
• donositi odluke = to make decisions (repeatedly, generally, habitually)

So although the literal image is something like bring decisions, the real meaning is simply make decisions.

Because the sentence is saying that our future depends on the decisions we make today. The act of making decisions is happening now / today, so the present tense is correct.

• donosimo danas = we make today / we are making today

The idea is:

• present actions → future consequences

This is very natural in both Croatian and English.

Both expressions point to the present, but they are not exactly the same in tone.

• danas = today
• u sadašnjosti = in the present

Using both creates emphasis:

• today, in the present

It sounds a bit reflective or rhetorical, as if the speaker wants to stress that the future is shaped by what we do right now.

In everyday speech, one of them might be enough, but having both is not wrong.

It sounds a bit more formal, abstract, or philosophical than just sada or danas.

Compare:

• sada = now
• danas = today
• u sadašnjosti = in the present

So this sentence has a slightly thoughtful or essay-like tone.

Yes, in many contexts you may hear both:

• ovisi o
• zavisi od

Both can mean depends on, but there are differences in standard usage and regional preference.

In standard Croatian, ovisiti o is generally the safer and more typically Croatian choice.

So this sentence is very natural as:

• naša budućnost ovisi o...

The sentence breaks down like this:

• Kažu
• da naša budućnost ovisi o tome
• kakve odluke donosimo danas, u sadašnjosti

More literally:

• They say
• that our future depends on that
• what kind of decisions we make today, in the present

Croatian word order is more flexible than English, but this order sounds natural and clear. It puts the main idea first, then explains what the future depends on.

Yes, it is grammatical and understandable. It sounds thoughtful and slightly formal.

The only thing to note is that danas and u sadašnjosti overlap in meaning, so the sentence is somewhat emphatic or stylistically heavy. That may be intentional.

A slightly simpler version would be:

• Kažu da naša budućnost ovisi o tome kakve odluke donosimo danas.

Or:

• Kažu da naša budućnost ovisi o odlukama koje donosimo danas.

But the original sentence is still perfectly valid.