El accidente mató al conductor.

Mató is the preterite form of matar for él/ella/usted: he/she/it killed.

So:

• matar = to kill
• mata = kills / is killing
• mató = killed
• mataba = was killing / used to kill

In El accidente mató al conductor, el accidente is singular, so the verb is in third person singular: mató.

The sentence refers to one completed event in the past, so the preterite is the natural choice.

The accent mark shows both pronunciation and meaning.

Compare:

• mato = I kill
• mató = he/she/it killed

So the accent is important. Without it, the word would be a different verb form.

Because Spanish uses the personal a before a specific human direct object.

Here, el conductor is the person affected by the action, so Spanish says:

• mató al conductor

not

• mató el conductor

That a does not mean to here. It is a grammatical marker used before specific people.

Because in Spanish, a + el contracts to al.

So:

• a + el conductor → al conductor

This contraction is required in normal Spanish.

A similar contraction happens with:

• de + el → del

The subject is El accidente.

That is the thing doing the action grammatically:

• El accidente = the accident
• mató = killed
• al conductor = the driver

So literally the structure is:

• The accident
  • killed
    • the driver

Even though an accident is not a person, it can still be the grammatical subject.

Yes. This is completely normal.

Spanish, like English, can use an inanimate thing as the subject:

• El accidente mató al conductor.
• La explosión mató a tres personas.
• El incendio mató a dos vecinos.

It sounds natural and direct.

Because both nouns are being treated as specific:

• El accidente = the accident
• el conductor = the driver

Spanish uses the definite article more often than English in some contexts, but here it matches English quite closely.

Also remember that even though conductor already has el, the personal a is still needed:

• al conductor = a + el conductor

Not always. In this sentence, conductor means driver.

In Spanish, conductor/conductora often means:

• driver of a car
• driver of a bus
• more generally, someone operating a vehicle

So here el conductor is the driver, not necessarily a train conductor or an orchestra conductor.

You would normally say:

• El accidente mató a la conductora.

Notice:

• conductora = female driver
• a + la does not contract

So:

• a la conductora is correct
• only a + el becomes al

Yes, but El accidente mató al conductor is the most neutral and standard order.

Spanish can change word order for emphasis, for example:

• Al conductor lo mató el accidente.

That puts more focus on the driver.

But for a simple, straightforward statement, the original sentence is best.

It is similar in meaning, but not exactly the same in focus.

• El accidente mató al conductor. = The accident killed the driver.
  • Focuses on the accident as the cause.
• El conductor murió en el accidente. = The driver died in the accident.
  • Focuses on the driver’s death.

Both are natural, but they present the event from different angles.

Al conductor is the direct object.

A common confusion is that learners see a and think it must be an indirect object, but here it is not.

Why?

Because the driver is the person directly affected by killed. The a is only the personal a, not an indirect-object marker.

So in:

• El accidente mató al conductor

we have:

• subject: El accidente
• verb: mató
• direct object: al conductor

In standard Spain Spanish, roughly:

• El accidente mató al conductor
• /el ak-si-DEN-te ma-TO al kon-duk-TOR/

A few useful notes:

• cc in accidente sounds like ks
• the stress in accidente is on den
• the stress in mató is on the last syllable because of the accent
• conductor is stressed on the last syllable: tor

If you are learning Spain Spanish, c before e/i is usually pronounced with the th sound of thin, but that does not affect conductor here because the c is before o.