Eylül gelince okullar açılıyor, ben de takvimimi yeniden düzenliyorum.

Gelince comes from the verb gelmek (to come) plus the ending -ince / -ınca, which usually means when, once, or as soon as.

So:

• gelmek = to come
• gelince = when it comes / once it comes

That makes Eylül gelince mean when September comes.

This structure is very common in Turkish:

• eve gelince = when he/she comes home
• seni görünce = when I see you
• bitirince = when he/she finishes

Because the sentence is expressing the time when something happens, not until something happens and not simply in September.

• Eylül gelince = when September arrives
• Eylülde = in September
• Eylül gelinceye kadar = until September comes

So Eylül gelince focuses on the moment or period that starts with September. It has a natural seasonal feel, like once September comes around...

Also, Eylül has no extra ending here because it is simply the subject of gelince.

Grammatically, açılıyor comes from açılmak, which often means to open or to be opened. In many contexts, it can look passive in English.

But in this sentence, okullar açılıyor is a very common Turkish expression meaning:

• schools open
• the school year starts
• schools resume

So yes, the literal structure is close to schools are opening / being opened, but the natural meaning is simply that schools start again after the break.

This is one of those cases where Turkish uses a verb that sounds slightly different from the most natural English expression.

Because the sentence is talking about schools in general, not one specific school.

• okul açılıyor = a/the school is opening
• okullar açılıyor = schools are opening / schools are starting

In Turkish, the plural is often used when talking about a whole group in a general real-world sense. Here it refers to the general back-to-school period.

Yes, -yor is the present continuous form, but in Turkish it is used more broadly than English is ...ing.

Here, açılıyor does not necessarily mean something is happening at this exact second. It can also describe:

• a regular seasonal event
• a vivid general situation
• something that happens as part of a recurring pattern

So Eylül gelince okullar açılıyor can mean something like:

• When September comes, schools open
• Once September arrives, schools are opening again

Turkish often uses -yor for this kind of lively, real-world recurring situation.

You could also hear okullar açılır, which is more like a plain general truth.
Açılıyor feels a bit more immediate and contextual.

Ben de means I too, I also, or in context something like and I also.

So:

• ben = I
• de = also / too

It is written separately because this de is a particle, not a suffix.

Compare:

• ben de geliyorum = I’m coming too
• evde = at home

These are different things:

• de = also/too → written separately
• -de = in/on/at → written attached to the word

In this sentence, ben de connects the second clause to the first: schools reopen, and I also reorganize my calendar.

Takvimimi breaks down like this:

• takvim = calendar
• takvimim = my calendar
• takvimimi = my calendar (as a definite direct object)

So the full structure is:

• takvim
  • -im = takvimim = my calendar
• takvimim
  • -i = takvimimi

The last -i is the accusative ending, used because the object is specific and definite: my calendar.

So in takvimimi yeniden düzenliyorum, the speaker is not reorganizing just any calendar, but my calendar specifically.

Because it is a definite direct object.

In Turkish, a specific object usually takes the accusative ending. Since my calendar is clearly specific, it takes accusative:

• takvimimi düzenliyorum = I’m organizing my calendar
• bir takvim düzenliyorum = I’m organizing a calendar

The possessive alone does not replace the accusative here. If the object is specific and directly affected by the verb, Turkish normally uses both:

• possessive ending: my
• accusative ending: marks it as the definite object

That is why you get takvimimi, not just takvimim.

Yeniden means again, anew, or afresh.

In this sentence, takvimimi yeniden düzenliyorum suggests:

• I reorganize my calendar again
• I set up my calendar anew
• I rearrange it from scratch for the new season

It is similar to tekrar, but there is a nuance:

• tekrar = again, one more time
• yeniden = again, but often with the sense of re-doing or making new

So yeniden düzenliyorum sounds very natural here because the calendar is being reorganized for a new period.

The sentence follows a very normal Turkish pattern:

• Eylül gelince = time clause
• okullar açılıyor = main statement
• ben de takvimimi yeniden düzenliyorum = second main statement

Turkish often puts:

1. time information early
2. the verb near the end of its clause

So:

• Eylül gelince okullar açılıyor
• ben de takvimimi yeniden düzenliyorum

is very natural.

Could it be rearranged? Yes, Turkish word order is flexible, but this version is clear and neutral. For example, ben de yeniden takvimimi düzenliyorum is possible, but it shifts emphasis slightly.

The original sentence sounds smooth and standard.

Because Turkish often links closely related clauses with punctuation and context rather than always using a full conjunction like English does.

Here, the connection is already clear because of ben de:

• okullar açılıyor = schools reopen
• ben de = I too / and I also

So the comma works naturally, and de helps create the sense of continuation.

A very natural English rendering would be:

• When September comes, schools reopen, and I reorganize my calendar too.

Turkish does not always need an exact equivalent of English and in such sentences.