Τον ειδοποίησα μόλις βρήκα το πορτοφόλι του.

Τον is the weak object pronoun meaning him. Greek often puts weak object pronouns before the verb, so:

• Τον ειδοποίησα = I notified him

This is different from English, where him usually comes after the verb.

A few related forms are:

• τον = him
• τη(ν) = her
• το = it

So the sentence literally begins with Him, I notified..., but in natural English we say I notified him...

Ειδοποίησα is the aorist form of ειδοποιώ (to notify / inform).

Here it means:

• I notified
• I informed

The Greek aorist is commonly used for a completed action in the past. In this sentence, the act of notifying is viewed as a single finished event.

So:

• ειδοποιώ = I notify / I am notifying
• ειδοποίησα = I notified

Βρήκα is the aorist of βρίσκω (to find), and it means I found.

It is in the aorist because the speaker is referring to a completed past event: the moment they found the wallet.

So both verbs are aorist because both actions are seen as completed:

• βρήκα = I found
• ειδοποίησα = I notified

This fits the meaning I notified him as soon as I found his wallet.

Here μόλις means as soon as.

So:

• μόλις βρήκα το πορτοφόλι του = as soon as I found his wallet

Be careful: μόλις can also mean just, depending on context.

For example:

• Μόλις έφτασα. = I just arrived.
• Μόλις έφτασα, σε πήρα τηλέφωνο. = As soon as I arrived, I called you.

So in this sentence, the meaning is clearly as soon as.

Greek often does not state the subject pronoun when it is already clear from the verb ending.

Both verbs show first person singular:

• ειδοποίησα = I notified
• βρήκα = I found

Because the verb endings already tell us the subject is I, Greek normally leaves out εγώ unless it is needed for emphasis or contrast.

So:

• Ειδοποίησα already means I notified
• Βρήκα already means I found

In this sentence, βρήκα means I found.

The ending -α here marks first person singular aorist, so the subject of βρήκα is the same speaker:

• βρήκα = I found

So the sentence means that the speaker found the wallet and then notified him.

If it were he found, you would expect something like:

• βρήκε = he/she found

Το πορτοφόλι του means his wallet.

Breakdown:

• το = the (neuter singular article)
• πορτοφόλι = wallet
• του = his

So literally it is:

• the wallet of him

Greek often expresses possession this way: noun + possessive weak pronoun.

Examples:

• το βιβλίο μου = my book
• το σπίτι της = her house
• το αυτοκίνητό τους = their car

In Greek, possessive weak pronouns normally come after the noun:

• το πορτοφόλι του = his wallet
• η τσάντα μου = my bag
• το όνομά της = her name

This is the normal Greek pattern. English does the opposite:

• his wallet
• my bag
• her name

So even though του means his, Greek places it after the thing possessed.

Yes. Του can have different functions in Greek depending on context.

It can be:

1. Possessive = his

   • το πορτοφόλι του = his wallet

2. A weak pronoun meaning to him / his in some other structures

In this sentence, because του follows a noun (πορτοφόλι), it is understood as a possessive:

• his wallet

So here there is no real confusion.

Yes, Greek word order is more flexible than English word order.

The given sentence:

• Τον ειδοποίησα μόλις βρήκα το πορτοφόλι του.

is a very natural way to say it.

But Greek can often rearrange parts of a sentence for emphasis or style, for example:

• Μόλις βρήκα το πορτοφόλι του, τον ειδοποίησα.

This still means the same thing: As soon as I found his wallet, I notified him.

The original version puts the main action first:

• I notified him...

The alternative puts the time clause first:

• As soon as I found his wallet...

Ειδοποίησα most directly means notified, informed, or alerted.

So:

• Τον ειδοποίησα = I notified him / I informed him

You might sometimes translate it more naturally as I told him, but ειδοποιώ usually has a sense of letting someone know, often about something important or relevant.

So in this sentence:

• I notified him as soon as I found his wallet
• I informed him as soon as I found his wallet

are very good translations.

Yes, Greek stress matters, and each of these words has a stressed syllable:

• Τον
• ειδοποίησα
• μόλις
• βρήκα
• το
• πορτοφόλι
• του

A learner should especially notice:

• μόλις has stress on the first syllable: MO-lis
• βρήκα has stress on the first syllable: VRI-ka
• πορτοφόλι has stress on -φό-: por-to-FO-li
• ειδοποίησα has stress on -ποί-: i-tho-POI-i-sa in standard modern pronunciation

Also, in connected speech, short words like τον, το, and του are usually unstressed and pronounced quickly together with nearby words.

Yes, it sounds completely natural.

A native speaker could very naturally say:

• Τον ειδοποίησα μόλις βρήκα το πορτοφόλι του.

It is clear, idiomatic, and grammatically normal.

A slightly different but equally natural version would be:

• Μόλις βρήκα το πορτοφόλι του, τον ειδοποίησα.

Both are common kinds of Greek sentence structure.