Автовладелец подал документы.

Not quite.

• автовладелец = car owner / vehicle owner
• водитель = driver

So автовладелец focuses on ownership, not on who is driving. A person can be an автовладелец even if someone else is driving the car.

Also, the word is built from:

• авто- = auto-, car
• владелец = owner, holder

So it literally means auto-owner.

It is in the nominative singular.

That is because it is the subject of the sentence — the person who performed the action.

You can identify it by asking Who submitted the documents?
Answer: автовладелец.

Подал is the past tense, masculine singular form of the verb.

In Russian, past-tense verbs agree with the subject in:

• gender in the singular
• number

Since автовладелец is a masculine singular noun, the verb becomes подал.

Compare:

• автовладелец подал документы = a male car owner submitted the documents
• автовладелица подала документы = a female car owner submitted the documents
• автовладельцы подали документы = car owners submitted the documents

Подал is perfective.

Its infinitive is подать. The imperfective partner is подавать.

Why that matters:

• подал = submitted, handed in, completed the action
• подавал = was submitting / used to submit / submitted repeatedly / was in the process of submitting

So in this sentence, подал документы presents the action as completed: the documents were successfully handed in.

Here документы is in the accusative plural, because it is the direct object of the verb подал.

The reason it looks the same as the dictionary plural form is that for inanimate masculine nouns, the:

• nominative plural = accusative plural

So:

• nominative plural: документы
• accusative plural: документы

That is normal Russian grammar, not a coincidence.

Very often it means paperwork, especially in official or bureaucratic contexts.

So подать документы is a very common expression meaning:

• to submit documents
• to hand in paperwork
• to file application papers

Depending on context, it could refer to things like registration papers, application forms, supporting documents, and so on.

Yes, very much so.

In Russian, подать документы is a standard bureaucratic phrase. It often means more than just physically handing over papers. It can imply something like:

• submitting an application
• filing paperwork officially
• turning in the required documents to an office or institution

So learners will hear it a lot in contexts like:

• university applications
• visa paperwork
• government services
• registration processes

Because Russian has no articles.

So Автовладелец подал документы could mean:

• The car owner submitted the documents
• A car owner submitted the documents

Which one sounds best depends on context.

Russian usually leaves that distinction to:

• context
• word order
• previous mention
• general situation

Yes. Russian word order is more flexible than English word order.

The neutral order here is:

• Автовладелец подал документы.

But other orders are possible, for example:

• Документы подал автовладелец.
• Автовладелец документы подал.

These versions still mean basically the same thing, but they change the focus or emphasis.

For example:

• starting with документы may emphasize the documents
• putting подал later can sound more contrastive or expressive

So the original sentence is the most neutral, straightforward version.

In normal everyday Russian, you would usually use the feminine noun and verb:

• Автовладелица подала документы.

Here:

• автовладелица = female car owner
• подала = feminine singular past tense

In some formal or bureaucratic styles, masculine nouns can sometimes be used in a more generic sense, but in an ordinary sentence about a specific woman, автовладелица подала is the natural choice.

The stress is:

• автовладе́лец
• по́дал
• докуме́нты

So the whole sentence is:

автовладе́лец по́дал докуме́нты

A rough pronunciation guide:

• автовладе́лец ≈ av-ta-vla-DYE-lets
• по́дал ≈ PO-dal
• докуме́нты ≈ da-ku-MYEN-ty

The stressed syllable is important in Russian, because wrong stress can make a word sound unnatural or even confusing.