Форматирование и редактура закончены.

Because the sentence has two subjects joined by и: форматирование and редактура.

Even though форматирование is neuter singular and редактура is feminine singular, together they form a plural idea: formatting and editing. So the predicate must be plural:

• Форматирование закончено. = The formatting is finished.
• Редактура закончена. = The editing is finished.
• Форматирование и редактура закончены. = The formatting and editing are finished.

Закончены is the short-form passive participle of закончить.

In this sentence, it means something like:

• finished
• completed

It agrees in number with the things that are finished, so here it is plural.

You can think of it as similar to English are finished or have been completed, depending on context.

In Russian, the verb to be is usually omitted in the present tense.

So where English says:

• The formatting and editing are finished

Russian simply says:

• Форматирование и редактура закончены.

This is completely normal. Russian does not usually use a present-tense equivalent of are in sentences like this.

They are in the nominative case because they are the subject of the sentence.

You can tell because the sentence is stating something about them: they are the things that are finished.

Dictionary forms:

• форматирование
• редактура

Those are also the forms used here.

Because the predicate must agree with the whole compound subject, not just with the first noun.

If there were only one noun:

• Форматирование закончено. → neuter singular

But with two nouns joined by и:

• Форматирование и редактура закончены. → plural

So the presence of редактура changes the agreement to plural.

Yes, in many contexts Russian speakers might also say:

• Форматирование и редактура закончились.

But the nuance is a little different.

• закончены focuses on the completed state/result: the work is finished.
• закончились is a finite verb meaning ended/finished.

So:

• Форматирование и редактура закончены sounds a bit more like have been completed
• Форматирование и редактура закончились sounds more like ended / came to an end

In practice, both can work, but закончены is especially natural when talking about tasks that have been completed.

They are related, but not always identical in feel.

• редактирование = the process of editing
• редактура = editing/editorial revision, often as a finished stage or type of work

In professional or publishing contexts, редактура can sound a bit more specialized or technical.

So in a workflow sentence like this, форматирование и редактура закончены sounds quite natural: it refers to stages of work that are complete.

Yes, it sounds fairly formal or work-related.

It would fit well in contexts like:

• publishing
• document preparation
• project updates
• professional communication

In casual speech, people might choose simpler phrasing depending on the situation, but this sentence is perfectly normal Russian.

Yes. Russian word order is flexible, so you could also say:

• Закончены форматирование и редактура.

This version puts more emphasis on the fact that they are finished.

The original order:

• Форматирование и редактура закончены.

is neutral and straightforward.

That is the most neutral subject + predicate order in Russian.

So the structure is:

• Форматирование и редактура = subject
• закончены = predicate

Russian often uses this order when simply reporting information with no special emphasis.

Not exactly. It behaves somewhat like an adjective because it agrees with the noun phrase, but grammatically it is better understood as a short-form passive participle.

That is why it expresses a result of an action:

• someone finished the formatting
• someone finished the editing

and now they are finished/completed.

So it is not just a simple descriptive adjective like большие or интересные. It carries the idea of a completed action.