Patent vekili yayın numarasını yeniden kontrol etti.

The most neutral Turkish word order is Subject–Object–Verb, and this sentence follows that pattern:

• Patent vekili = subject
• yayın numarasını = object
• yeniden = adverb
• kontrol etti = verb

So it is structured very naturally for Turkish.

Because patent vekili is a noun compound in Turkish.

A very common pattern is:

• first noun: stays bare
• second noun: takes a 3rd-person possessive-type ending

So:

• patent vekili = patent attorney / patent agent / patent representative

That -i does not necessarily mean literal possession here. It is part of the normal compound structure.

These mean different things.

• patent vekili = patent attorney / patent agent
  
  • this is a standard compound, like a job title
• patentin vekili = the representative of the patent
  
  • this sounds like a more literal possession relationship

So in your sentence, patent vekili is used because it names a profession or role, not because one specific patent owns a representative.

Because it contains several pieces:

• numara = number
• numarası = its number / the number of it / number in a compound form
• numarasını = numarası
  • accusative ending

More exactly:

• numara-sı-nı

Here:

• -sı is the compound/possessive-type ending
• -nı is the accusative ending
• the n is a buffer consonant

So yayın numarasını means the publication number as a specific direct object.

Not necessarily. In Turkish, many noun compounds use this form even when there is no real ownership.

So:

• yayın numarası = publication number
• not necessarily its number in a literal English sense

This is just a normal Turkish way to connect two nouns. English often uses noun+noun combinations, and Turkish often uses compound structures like this instead.

There are two main clues:

• it appears before the verb
• it has the accusative ending -ı

In Turkish, a definite/specific direct object often takes the accusative. Since this is the thing that was checked, yayın numarasını is the object.

Because Turkish does not have articles like English the and a/an.

Instead, Turkish usually shows these ideas through:

• context
• word order
• case marking

For example, the accusative ending on numarasını helps show that this is a specific publication number, which often corresponds to English the publication number.

Here yeniden means again.

In many sentences, yeniden and tekrar are very close:

• yayın numarasını yeniden kontrol etti
• yayın numarasını tekrar kontrol etti

Both can mean checked the publication number again.

Sometimes yeniden can feel a bit more like anew or once more, but in this sentence the practical meaning is simply again.

Because kontrol etmek is a common Turkish compound verb.

It is built from:

• kontrol = check / control
• etmek = to do

Together:

• kontrol etmek = to check

In the past tense:

• etti = did
• so kontrol etti = checked

Turkish has many verbs like this, especially with borrowed nouns:

• yardım etmek = to help
• telefon etmek = to phone

It is simple past tense.

Breakdown:

• et- = do
• -ti = past tense marker

So kontrol etti means checked.

The verb form is 3rd-person singular, so it can mean:

• he checked
• she checked
• it checked

The noun patent vekili tells you who the subject is.

You usually know from context, not from the noun itself.

Since Turkish has no articles, patent vekili can correspond to:

• a patent attorney
• the patent attorney

Both are possible in isolation. The surrounding context tells you which one is intended.