Recykling nie jest skomplikowany.

Recykling is the subject of the sentence: the thing being talked about. It is in the nominative case, which is the normal case for the subject of a sentence.

So the structure is:

• Recykling = recycling
• nie jest = is not
• skomplikowany = complicated

So literally: Recycling is not complicated.

In standard Polish, you need jest here.

Jest is the 3rd person singular form of być (to be), and it matches the singular subject recykling.

• Recykling jest skomplikowany. = Recycling is complicated.
• Recykling nie jest skomplikowany. = Recycling is not complicated.

Unlike in some other Slavic languages, you generally do not omit the present-tense form of to be in normal Polish sentences like this.

In Polish, nie usually goes before the verb and is written separately from it.

So:

• jest = is
• nie jest = is not

This is completely normal Polish spelling.

Compare:

• To jest łatwe. = This is easy.
• To nie jest łatwe. = This is not easy.

Because the adjective has to agree with the noun it describes.

Recykling is:

• singular
• masculine
• inanimate

So the adjective also takes the masculine singular form:

• skomplikowany = masculine singular
• skomplikowana = feminine singular
• skomplikowane = neuter singular or non-masculine-personal plural

That is why the sentence uses skomplikowany.

Yes, recykling is treated as a masculine inanimate noun in Polish.

A very common clue is that it ends in a consonant. Many Polish nouns that end in a consonant are masculine.

Even though recykling is a borrowed word, it behaves like a normal Polish masculine noun.

This is a good question, because Polish behaves differently depending on whether the complement is an adjective or a noun.

Here, skomplikowany is an adjective, and with być it normally stays in the nominative:

• Recykling jest skomplikowany.

But if you use a noun after być, Polish often uses the instrumental:

• On jest nauczycielem. = He is a teacher.

So in your sentence, skomplikowany is correct because it is an adjective agreeing with recykling.

Yes, you could. It means something like Recycling is uncomplicated.

There is a small nuance:

• nie jest skomplikowany = is not complicated
• jest nieskomplikowany = is uncomplicated

The first version is often more neutral and more natural in everyday speech. The second is also correct, but can sound a bit more formal or descriptive.

The word order here is the most neutral and natural one:

• Recykling nie jest skomplikowany.

Polish word order is fairly flexible, but changing it usually changes emphasis, not the core meaning.

For example, other orders may sound marked or stylistically different. For a learner, the safest default is:

subject + nie jest + adjective

So this sentence is a very good standard model.

A rough English-friendly guide is:

re-CYK-ling nye yest skom-plee-ko-VA-nih

A few useful points:

• Polish stress is usually on the second-to-last syllable.
• nie sounds roughly like nye
• jest sounds roughly like yest
• cy in recykling is not like English see; it is closer to tsy
• the w in skomplikowany is pronounced like English v

So:

• recykling → stress on CYK
• skomplikowany → stress on WA

Not exactly.

• skomplikowany = complicated, complex
• trudny = difficult, hard

Sometimes both can work in English as hard, but in Polish they are not identical.

So:

• Recykling nie jest skomplikowany. = Recycling is not complicated.
• Recykling nie jest trudny. = Recycling is not difficult.

The first focuses more on complexity; the second focuses more on how hard it is to do.

It is a borrowed word, but it is completely normal in modern Polish.

Polish uses many international words, and recykling is one of them. Even though it comes from English, it follows Polish grammar like a regular noun.

So a learner should treat it as a standard Polish vocabulary item, not as a foreign word that stays outside the grammar system.