Эта постановка интереснее прошлой, потому что сценарий в ней понятнее.

In the present tense, Russian normally leaves out есть when it simply means is/are.

So this sentence is understood as:

Эта постановка [есть] интереснее прошлой, потому что сценарий в ней [есть] понятнее.

A very literal English version would be:

This production more interesting than the previous one, because the script in it clearer.

That sounds wrong in English, but it is normal in Russian.

Постановка usually means a production, staging, or performance version of a work, especially in theater.

So эта постановка is not just this play in the abstract. It means this particular staged version or production.

Depending on context, it could be:

• a theater production
• an opera production
• sometimes a staged version of some written work

Because постановка is a feminine noun.

Russian demonstratives must agree with the noun in gender, number, and case:

• masculine: этот
• feminine: эта
• neuter: это
• plural: эти

Since постановка is feminine singular nominative, the correct form is эта.

These are comparative forms:

• интересный → интереснее = more interesting
• понятный → понятнее = clearer / easier to understand

Russian often uses these short comparative forms instead of более + adjective.

So:

• интереснее = more interesting
• понятнее = clearer

You could also say:

• более интересная
• более понятный

But интереснее and понятнее are very natural and common.

No. These comparative forms are basically invariable in this kind of use.

So you can say:

• постановка интереснее
• фильм интереснее
• книги интереснее

The comparative form itself stays the same.

That is different from normal adjectives like интересный / интересная / интересное / интересные, which do change.

Here прошлой is genitive singular feminine, and the noun постановки is omitted.

The full underlying idea is:

Эта постановка интереснее прошлой постановки.

Russian often uses the genitive after a comparative to mean than.

So:

• интереснее прошлой = more interesting than the previous one
• literally: more interesting than the previous production

Because постановка is feminine, the adjective appears as прошлой.

Yes. Russian has two common ways to express comparison:

1. comparative + genitive
   Эта постановка интереснее прошлой.

2. comparative + чем
   Эта постановка интереснее, чем прошлая.

Both are correct.

The version with the genitive is often more compact. The чем version can feel a bit more explicit.

You could also say: Эта постановка интереснее, чем прошлая постановка.

В ней means in it, referring back to постановка.

• в = in
• ней = her/it, prepositional form of она

Since постановка is feminine, the pronoun is feminine too.

So:

• в ней = in it
• not в нём, because that would refer to a masculine noun

In Russian, it is natural to say that a script, idea, or feature is in a production, film, book, and so on.

Russian word order is flexible, and this order is natural.

Сценарий в ней понятнее means: the script in it is clearer

You could also hear:

• В ней сценарий понятнее
• Сценарий понятнее в ней

But those alternatives may shift emphasis slightly.

The given version is a neutral, natural way to say it.

Потому что means because and introduces the reason:

Эта постановка интереснее прошлой, потому что сценарий в ней понятнее.

So the structure is:

• statement: This production is more interesting than the previous one
• reason: because the script in it is clearer

It is one of the most common ways to say because in Russian.

Both are possible, depending on context.

Понятнее comes from понятный, which means:

• understandable
• clear
• easy to follow

So in this sentence:

• the script is clearer
• the script is more understandable
• the script is easier to follow

All of these can work. In natural English, clearer is often the smoothest choice.

Yes. The logic is:

This production is more interesting than the previous one because the script in it is clearer.

So the clearer script is presented as the reason this production feels more interesting.

Russian often builds sentences this way:

• comparison first
• explanation after потому что

That makes the sentence sound very natural and well organized.