Nisan gelince ilkbahar iyice hissediliyor, parkta daha uzun yürüyoruz.

Gelince comes from gelmek (to come) plus the converb ending -ince / -ınca / -ünce / -unca.

In this sentence, gelince means when it comes, once it comes, or upon coming.

So:

• Nisan gelince = when April comes / once April arrives

This -ince form is very common in Turkish for time relationships:

• Eve gelince ararım. = When I get home, I’ll call.
• Seni görünce sevindim. = I was happy when I saw you.

It often sounds very natural and compact in Turkish.

Because Turkish, like English sometimes does, naturally talks about time periods as if they arrive or come.

So Nisan gelince is not strange or overly poetic. It is a normal way to say:

• when April comes
• once April arrives

English does this too in phrases like:

• When spring comes...
• Summer is coming.

So the Turkish expression is quite straightforward and idiomatic.

Yes. Nisan geldiğinde would also be natural.

The difference is small:

• Nisan gelince = when April comes / once April arrives
• Nisan geldiğinde = when April has arrived / when it is April

In many everyday contexts, they are very close and often interchangeable.

A rough nuance:

• -ince can feel a bit more like as soon as / once
• -diğinde can feel a bit more like when it is in that state/time

But in this sentence, both would sound fine.

This is a very common Turkish style choice.

İlkbahar iyice hissediliyor is an impersonal/passive way of speaking. It means something like:

• Spring is really being felt
• You can really feel spring
• Spring is very noticeable

It does not focus on a specific person doing the feeling.

By contrast:

• İlkbaharı iyice hissediyoruz = We really feel spring

That version is more personal and direct, because we are explicitly the experiencers.

So the original sentence sounds broader and more atmospheric, almost like describing the general feeling in the air.

Hissediliyor comes from the verb hissetmek (to feel).

Its structure is roughly:

• hisset- = feel
• -il- = passive
• -iyor = present continuous / current ongoing present

So:

• hissediliyor = is being felt / can be felt

In natural English, you usually would not translate it word-for-word. A more natural translation is often:

• spring is really noticeable
• you can really feel spring

İyice means something like:

• thoroughly
• properly
• well
• really
• quite clearly

In this sentence, it gives the sense that spring is no longer just faintly present — it is now clearly noticeable.

So ilkbahar iyice hissediliyor is like:

• you can really feel spring now
• spring is clearly in the air

It adds emphasis, not just literal intensity.

Yes, -iyor is the present continuous form, but in Turkish it is used more broadly than English am/is/are ...-ing.

It can describe:

• something happening right now
• something happening around this time or season
• a current habit or repeated action

So in this sentence:

• hissediliyor = spring is being felt / is noticeable at this time
• yürüyoruz = we are walking more / we walk more during this period

This does not have to mean at this exact moment.

Turkish often uses -iyor for present-time habits, especially when talking about what people are doing these days, this season, or in the current situation.

Literally, it means we walk longer.

In natural English, that usually means:

• we walk for a longer time
• we take longer walks

It often suggests duration more than physical distance, although context can leave it a little open.

If Turkish wanted to make the idea of time completely explicit, it could say:

• daha uzun süre yürüyoruz = we walk for a longer time

But daha uzun yürüyoruz is perfectly normal and natural.

Because parkta uses the locative ending -da / -de / -ta / -te, which means in or at a place.

So:

• parkta = in the park / at the park

By contrast:

• parka = to the park (direction toward the park)

Since the walking happens in the park, parkta is the correct choice.

Because Turkish verb endings already show the subject.

• yürüyoruz = we are walking / we walk

The -uz ending tells you the subject is we.

Turkish often leaves pronouns out unless they are needed for contrast, emphasis, or clarity.

So:

• Parkta daha uzun yürüyoruz. = We walk longer in the park.

You could say biz yürüyoruz, but biz would add emphasis, something like:

• we are the ones walking longer

Without emphasis, the pronoun is usually omitted.

Yes, Turkish word order is flexible, although some orders sound more neutral than others.

The original sentence is natural and neutral:

• Nisan gelince ilkbahar iyice hissediliyor, parkta daha uzun yürüyoruz.

You could move some parts for emphasis, for example:

• Nisan gelince parkta daha uzun yürüyoruz.
• Parkta daha uzun yürüyoruz, Nisan gelince ilkbahar iyice hissediliyor.

But each version shifts the focus a little.

As for the comma: it helps separate the two related clauses and makes the sentence easier to read. Turkish punctuation can be somewhat flexible here, but the comma is very normal in this kind of sentence.

You could also explicitly add ve (and) if you wanted:

• Nisan gelince ilkbahar iyice hissediliyor ve parkta daha uzun yürüyoruz.

That is also correct, but the version without ve sounds smooth and natural too.