Bahar gelince değişim hemen hissediliyor.

Gelince comes from gelmek (to come) + -ince.

The suffix -ince / -ınca / -ünce / -unca usually means:

• when
• once
• as soon as

So bahar gelince means when spring comes or once spring arrives.

It introduces a time clause, similar to English when spring comes.

Both are possible, but they are a little different in feel.

• Bahar gelince = when spring comes / once spring arrives
• Bahar geldiğinde = when spring comes/came, often a bit more neutral or descriptive

In many cases, they can be translated similarly.
However, -ince often feels a bit more immediate or event-based: as soon as X happens, Y happens.

So in this sentence, bahar gelince nicely suggests:

• spring arrives
• then the change is immediately noticeable

Turkish has no words equivalent to English a or the in most normal cases.

So bahar can mean:

• spring
• the spring season

The context tells you which is meant. Here it clearly means spring as a season.

Değişim means change.

It is a noun, not a verb. So the structure is:

• bahar gelince = when spring comes
• değişim = the change
• hemen hissediliyor = is felt immediately

So değişim is the thing being felt.

Because the sentence uses the passive.

• hissetmek = to feel
• hissedilmek = to be felt
• hissediliyor = is being felt / is felt

So this sentence does not mean someone feels the change directly.
It means the change is felt.

That is very natural in Turkish when the person experiencing something is general, unknown, or unimportant.

It can be broken down like this:

• hisset- = feel
• -il- = passive
• -iyor = present continuous
• (3rd person singular) = no extra ending needed here

So:

• hissetmek → hissedilmek = to be felt
• hissediliyor = it is being felt / it is felt

You may notice the form looks like hissedil- rather than hissetil-. This is a normal sound/spelling change in Turkish.

In Turkish, -iyor does not only mean something happening right this second. It is also often used for:

• current situations
• vivid general statements
• things that are noticeably happening

So hemen hissediliyor gives the sense that when spring arrives, the change becomes immediately noticeable.

A more general version could be:

• Bahar gelince değişim hemen hissedilir.

That would sound more like a general fact or proverb-like statement.

By contrast:

• hissediliyor feels more immediate and alive.

Hemen means immediately / right away.

It shows that the change is felt without delay.

So the sentence suggests that as soon as spring comes, the effects are noticeable at once.

No, Turkish word order is flexible.

The given sentence is:

• Bahar gelince değişim hemen hissediliyor.

But you could also say:

• Bahar gelince hemen değişim hissediliyor.
• Değişim bahar gelince hemen hissediliyor.

These versions are all understandable, but the emphasis shifts a little.

The original sounds natural and balanced:

• time clause first
• then the main idea

Turkish often leaves that unspecified, especially with the passive.

In English, we might say:

• You can feel the change immediately
• The change is immediately felt
• People immediately feel the change

Turkish often prefers the passive here:

• değişim hemen hissediliyor

This keeps the sentence general and impersonal.

Yes, that is a very natural English way to express the same idea.

Even though Turkish uses a passive form (is felt), the meaning is often close to:

• you immediately feel the change
• people immediately notice the change

So the Turkish structure is passive, but the real-life meaning is broad and general.

No. Gelmek often means to come, but it is also used for seasons, times, events, and conditions.

So:

• bahar gelince = when spring comes
• akşam gelince = when evening comes
• sıra bana gelince = when it is my turn

This is completely normal Turkish usage.

Sometimes Turkish can omit nouns if the meaning is obvious, but in this sentence değişim is the main thing being talked about, so keeping it makes the sentence clear.

Without it, the sentence would need a different structure, for example:

• Bahar gelince her şey hemen hissediliyor would not work the same way.
• Bahar gelince fark hemen hissediliyor = the difference is felt immediately
• Bahar gelince değişiklik hemen hissediliyor = the change/alteration is felt immediately

So değişim is an important part of this exact sentence.

It has two parts:

1. Bahar gelince
   = a subordinate time clause
   = when spring comes

2. değişim hemen hissediliyor
   = the main clause
   = the change is immediately felt

So the full pattern is:

• [When X happens], [Y is felt/noticed].

That is a very common Turkish sentence pattern.