Zakres ochrony jest szeroki.

• zakres = the subject of the sentence; nominative singular, masculine inanimate
• ochrony = a dependent noun meaning of protection; genitive singular of ochrona
• jest = is; 3rd person singular present tense of być (to be)
• szeroki = an adjective meaning broad / wide; it agrees with zakres

So the structure is basically:

[subject] + [of-phrase] + [is] + [adjective]

Because zakres normally takes the genitive when you mean the scope/range of something.

• zakres ochrony = scope of protection
• literally: scope of protection, not scope protection

The base form is ochrona.
Here it changes to ochrony, which is the genitive singular form.

This is very common in Polish: one noun is followed by another noun in the genitive to show a relationship like of X.

Examples:

• zakres prac = scope of work
• zakres obowiązków = scope of duties
• zakres usług = range/scope of services

Szeroki is masculine singular nominative.

It has that form because it agrees with zakres, and zakres is:

• masculine
• singular
• nominative

So:

• szeroki → masculine singular
• szeroka → feminine singular
• szerokie → neuter singular or non-masculine-personal plural

Examples:

• Droga jest szeroka. = The road is wide.
• Morze jest szerokie. = The sea is wide.
• Zakres jest szeroki. = The scope is broad.

Great question. In Polish:

• a predicate adjective after być usually stays in the nominative
• a predicate noun often goes into the instrumental

So:

• Zakres jest szeroki. → adjective, so nominative
• Jan jest lekarzem. → noun, so instrumental

Compare:

• Ona jest miła. = She is nice.
• On jest zmęczony. = He is tired.
• On jest nauczycielem. = He is a teacher.

So szeroki is nominative because it is an adjective describing the subject.

In a normal full sentence, jest is the standard form:

Zakres ochrony jest szeroki.

In some styles, especially:

• headlines
• notes
• formal labels
• very compressed style

you may see the present-tense to be omitted:

Zakres ochrony szeroki.

But that is not the normal neutral sentence for everyday grammar practice. For a learner, it is best to use jest here.

The neutral, most standard order is:

Zakres ochrony jest szeroki.

But Polish word order is more flexible than English, because case endings show grammatical relationships.

Other orders are possible, for example:

• Szeroki jest zakres ochrony.
• Zakres ochrony szeroki jest. — possible, but marked and uncommon

These alternatives usually change the focus or emphasis, not the core meaning.

For learners, the safest version is the original one.

Because Polish does not have articles like English a / an / the.

So zakres ochrony can mean:

• the scope of protection
• a scope of protection

Which one is meant depends on context.

This is normal in Polish and something English speakers have to get used to.

A rough pronunciation guide is:

ZAH-kres oh-HRO-nih yest sheh-RO-kee

A few important sound notes:

• rz in zakres sounds like a voiced Polish sound somewhat similar to the s in measure, but harder
• ch in ochrony sounds like the ch in German Bach or Scottish loch
• sz in szeroki sounds like sh, but with the tongue slightly farther back
• j in jest sounds like English y in yes

Stress: Polish stress is usually on the second-to-last syllable of a word:

• zaKRES
• oCHROny
• JEST (one syllable)
• szeROki

Formally, ochrony can be more than one thing depending on context, because it can be:

• genitive singular of ochrona
• or nominative/accusative plural in some contexts

But in zakres ochrony, it is understood as genitive singular: scope of protection.

Why? Because zakres + genitive is a very common pattern, and that is what makes sense here.

You sometimes could, but the meaning or style changes.

• szeroki = broad, wide, extensive
• duży = big, large

With abstract things like zakres, Polish often prefers szeroki, because it sounds more natural for scope/range.

So:

• zakres ochrony jest szeroki = very natural
• zakres ochrony jest duży = possible in some contexts, but less idiomatic

A good English parallel is that we naturally say broad scope more often than big scope.

Yes, that is a very good idea.

Even though the grammar is explainable, zakres + genitive noun is a very common pattern in Polish. Learning it as a chunk will help you sound more natural.

Useful chunks:

• zakres ochrony
• zakres usług
• zakres obowiązków
• zakres prac

That way you do not have to build the phrase from scratch every time.