Kiviyi soyup yoğurdun içine koydum, ananası ise akşama bıraktım.

Because they are definite direct objects, so they take the accusative suffix.

• kivi → kiviyi
• ananas → ananası

In this sentence, the speaker is talking about a specific kiwi and a specific pineapple, not kiwi/pineapple in general.

A useful breakdown:

• kivi + -(y)i → kiviyi
• ananas + -ı → ananası

The y in kiviyi is just a buffer consonant. Turkish often inserts y when a suffix beginning with a vowel is added to a word that already ends in a vowel.

Soyup comes from soymak and uses the converb suffix -(y)Ip.

So:

• soymak = to peel
• soyup = peeling / having peeled / and peeled

In this sentence, soyup links two actions done by the same subject:

• Kiviyi soyup ... koydum
• literally: Having peeled the kiwi, I put it...
• more naturally: I peeled the kiwi and put it...

Only the last finite verb carries the tense and person marking here:

• koydum = I put
• soyup does not show tense/person by itself

This is a very common Turkish structure for sequences of actions.

Yoğurdun içine literally means into the inside of the yogurt.

Breakdown:

• yoğurt = yogurt
• yoğurdun = of the yogurt
• iç = inside
• içi = its inside
• içine = into its inside

So yoğurdun içine koydum is literally something like:

• I put it into the yogurt’s inside

But in natural English, that is just:

• I put it into the yogurt

Turkish very often uses these location nouns such as:

• içinde / içine = in / into
• üstünde / üstüne = on / onto
• altında / altına = under / underneath to

You could sometimes say yoğurda koydum, but yoğurdun içine koydum is more explicit and very natural.

Because yoğurt undergoes a common consonant change when a vowel-initial suffix is added.

The final t becomes d:

• yoğurt → yoğurdu
• yoğurt → yoğurdun

This kind of voicing change is common in Turkish, especially with final:

• p → b
• ç → c
• t → d
• k → ğ / g

Not every word behaves exactly the same way, but yoğurt does.

Here, ise is a contrastive topic marker. It often means something like:

• as for
• whereas
• on the other hand
• sometimes simply but

So:

• ananası ise = as for the pineapple
• or the pineapple, on the other hand

It sets up a contrast between the two fruits:

• the kiwi was peeled and put into the yogurt
• the pineapple was treated differently

So ise is helping mark that contrast.

Because ise usually follows the word or phrase it is contrasting or highlighting.

So:

• ananası ise = as for the pineapple...

Turkish often places this kind of particle after the topic, rather than before it.

That is why it sounds natural here, while an English speaker might expect something more like but the pineapple...

Because the dative is used here with a time expression.

• akşam = evening
• akşama = to/until/for the evening

In the expression bir şeyi akşama bırakmak, the meaning is:

• to leave something until the evening
• to save something for the evening
• to postpone something until evening

So this is not really about physical movement. It is more like a time destination.

Compare:

• yarına bırakalım = let’s leave it until tomorrow
• sonraya bırakmak = to leave it for later

Not necessarily in the physical sense.

Bırakmak has a wide range of meanings, including:

• to leave
• to put down
• to let remain
• to set aside
• to postpone
• to save for later

In ananası ise akşama bıraktım, the most natural sense is:

• I left the pineapple for the evening
• I saved the pineapple for the evening
• I postponed the pineapple until evening

So it does not have to mean that the speaker physically walked away from it.

Because Turkish usually drops subject pronouns when the verb already makes the subject clear.

Here the finite verbs show first person singular:

• koydum = I put
• bıraktım = I left / saved

So ben is unnecessary unless the speaker wants emphasis.

For example:

• Ben koydum would sound more like I’m the one who put it

In normal speech, Turkish usually leaves ben out.

Yes, it is very natural Turkish word order.

Turkish is generally verb-final, so the main verbs come at the end of their clauses:

• Kiviyi soyup yoğurdun içine koydum
• ananası ise akşama bıraktım

Also, Turkish often puts the topic or contrastive element early in the clause. That is why ananası ise comes first in the second part: it highlights the pineapple as the contrasting item.

So the sentence structure is doing two things at once:

• keeping the verbs near the end, which is normal in Turkish
• putting important contrastive information early, which is also normal in Turkish