Raporu okuyunca kaydın tarihinden şüphelendim.

Yes:

• Raporu = rapor

  • -u
    the report as a specific direct object

• okuyunca = oku-

  • -yınca
    when/after/as soon as (someone) read(s)

• kaydın = kayıt

  • -ın
    of the record / of the entry

• tarihinden = tarih

  • -i
    • -nden
      from/about its date

• şüphelendim = şüphelen-

  • -di-
    • -m
      I became suspicious / I suspected

So the structure is roughly:

[Raporu okuyunca] [kaydın tarihinden] [şüphelendim].
= When/after reading the report, I became suspicious about the date of the record.

-yınca / -ince / -unca / -ünce is a converb suffix. It often means:

• when
• once
• after
• sometimes as soon as

So okuyunca means something like:

• when I read
• after reading
• once I had read

In this sentence, it connects the first action to the second:

• first: reading the report
• then: becoming suspicious

A useful point: with this form, the subject is often understood to be the same as the subject of the main verb unless another subject is clearly stated.

Because okumak is a transitive verb, and here the speaker is talking about a specific report.

• rapor okumak = to read a report / reports in a general sense
• raporu okumak = to read the report / that report

The accusative ending -ı / -i / -u / -ü often marks a definite, specific direct object in Turkish.

So:

• rapor = a report / report(s) in general
• raporu = the report

This is because of a common sound change in Turkish called consonant softening.

The dictionary form is kayıt.
When a vowel-initial suffix is added, the final t often changes to d:

• kayıt
• kaydın = of the record
• kaydı = its record / the record
• kayda = to the record

So kaydın is the correct genitive form, not kayıtın.

Because there are actually two things happening there.

1) Possessive marking

kaydın tarihi means the date of the record.

In Turkish noun phrases of this type:

• the first noun takes the genitive: kaydın
• the second noun takes a possessive ending: tarihi

So:

• kaydın tarihi = the record's date

2) Ablative case

The verb şüphelenmek usually takes -den.

So tarihi becomes:

• tarihi
• tarihinden = from/about its date

The full chain is:

• kayıt → kaydın
• tarih → tarih-i
• tarih-i-nden

So kaydın tarihinden literally looks like from the record's date, but in English it is better understood as about the date of the record or of the date on the record, depending on context.

Because şüphelenmek normally takes the ablative case, which is the -den / -dan / -ten / -tan ending.

Examples:

• birinden şüphelenmek = to suspect someone
• bir şeyden şüphelenmek = to be suspicious of something
• ondan şüpheleniyorum = I suspect him/her/that

So in your sentence:

• kaydın tarihinden şüphelendim
  = I became suspicious of the date of the record

This is one of those verb patterns that you mainly learn as a unit:

• şüphelenmek + -den

Şüphelendim is the past tense, first person singular form of şüphelenmek.

It breaks down like this:

• şüphelen- = to become suspicious / to suspect
• -di = past tense
• -m = I

So şüphelendim means:

• I became suspicious
• I got suspicious
• in context, often simply I suspected

It is slightly closer to I became suspicious than to a flat dictionary-style I suspected, because the verb has that sense of entering a state of suspicion.

It is built into the verb.

In Turkish, personal endings on the verb usually make subject pronouns unnecessary unless you want emphasis or contrast.

Here:

• şüphelendim
• the ending -m tells you the subject is I

So Turkish does not need a separate ben here.

If you said Ben şüphelendim, that would be more emphatic, like:

• I became suspicious

But in a normal sentence, just şüphelendim is enough.

It can cover both ideas, depending on context.

okuyunca often suggests:

• when I read
• once I read
• after reading
• as soon as I read

In this sentence, the natural sense is that reading the report led to the suspicion. So English might render it in several ways:

• When I read the report...
• After reading the report...
• Once I read the report...

All are close.

If you want a more explicitly sequential after doing X, Turkish often uses:

• okuduktan sonra = after reading

So:

• Raporu okuyunca... = slightly more compact, often very natural
• Raporu okuduktan sonra... = more explicitly after

No, Turkish word order is flexible, although some orders sound more neutral than others.

The given sentence is very natural:

• Raporu okuyunca kaydın tarihinden şüphelendim.

This puts the background action first, then the thing suspected, then the main verb at the end.

You could also hear variations like:

• Kaydın tarihinden raporu okuyunca şüphelendim.
• Raporu okuyunca şüphelendim kaydın tarihinden.
  This is less neutral and more marked.

The most neutral pattern in Turkish is still to keep the main finite verb at the end. The part placed right before the verb often gets extra focus.

No. That would not be correct.

Şüphelenmek does not take a direct object in the accusative. It normally takes -den.

So:

• kaydın tarihinden şüphelendim = correct
• kaydın tarihini şüphelendim = incorrect

This is important because English says suspect something, but Turkish does not map onto that structure directly here.

Think of it as:

• şüphelenmek + -den

not

• şüphelenmek + accusative

Because tarih can mean both date and history, and context decides which one is meant.

In a phrase like:

• kaydın tarihi

the natural meaning is the date of the record/entry, not the history of the record.

Since the sentence is about reading a report and then becoming suspicious, date is the meaning that fits best.