Yazı tipi fazla süslü olunca metin anlaşılmıyor; ben daha sade bir yazı tipi seçtim.

Yazı tipi is a very common Turkish noun compound meaning font or typeface.

It is built like this:

• yazı = writing
• tipi = its type / type of

In this kind of compound, the second noun usually takes the compound ending -(s)I. So tip becomes tipi.

Literally, yazı tipi is something like type of writing.

Not exactly.

• çok süslü = very ornate / very decorative
• fazla süslü = too ornate / overly decorative

So fazla suggests excess. It implies that the font is decorative to a degree that causes a problem.

That fits the next clause, where the result is that the text is hard to understand.

Olunca comes from olmak + -ınca/-ince/-unca/-ünce.

This ending often means things like:

• when
• once
• sometimes if
• sometimes since/because, depending on context

Here, fazla süslü olunca means something like when it is too ornate or since it is too ornate.

So it connects the first idea to the result: if the font becomes too decorative, the text is not easily understood.

Anlaşılmıyor means is not understood or does not come across clearly.

The verb here is anlaşılmak = to be understood.
So:

• anlaşılmıyor = is not being understood / is not understandable in practice

This is very natural in Turkish when talking about clarity, readability, or whether something makes sense.

If you said anlamıyor, that would mean he/she/it does not understand, which is a different structure and a different subject.

In Turkish, the present continuous form with -yor is often used not only for actions happening right now, but also for present situations and practical general observations.

So metin anlaşılmıyor can mean:

• the text is not coming across clearly
• the text is not understandable
• people are not able to understand the text

A more general or formal-sounding version might be metin anlaşılmaz, but anlaşılmıyor sounds very natural in everyday Turkish.

Yes, metin is the subject of anlaşılmıyor.

The structure is basically:

• metin = the text
• anlaşılmıyor = is not understood

Because it is the subject, it stays in the basic form, with no accusative ending.

So:

• metin anlaşılmıyor = the text is not understood

Using metni here would be wrong for this sentence.

Yes, it could be left out.

Turkish often drops subject pronouns because the verb already shows the person. So seçtim already means I chose.

But ben is added here for emphasis or contrast. It gives a feeling like:

• I, on the other hand, chose...
• As for me, I chose...

That works well because the second clause contrasts with the first one.

This is a normal Turkish adjective phrase:

• daha = more
• sade = plain / simple
• bir = a
• yazı tipi = font

So daha sade bir yazı tipi means a simpler font or a plainer font.

Turkish puts daha before the adjective, just like English puts more before the adjective.

Also, Turkish does not need to say than that one if the comparison is already clear from context.

Because repeating the noun is very natural in Turkish.

In English, we might say I chose a simpler one. Turkish can sometimes shorten things too, but repeating the noun often sounds clearer and more natural:

• daha sade bir yazı tipi seçtim

So the repetition is not awkward; it is standard and idiomatic.

Yes, it could, but the nuance changes a little.

• olunca is shorter and very natural in everyday Turkish
• olduğunda sounds a bit more neutral or formal

Both can mean when it is/becomes, but olunca often feels smoother in cause-and-result sentences like this one.

So:

• Yazı tipi fazla süslü olunca...
  feels very natural here.

Seçtim breaks down like this:

• seç- = choose
• -ti = past tense
• -m = I

So it means I chose.

It shows a completed action in the past. The speaker is saying that they made that choice already.

That is why it is not seçiyorum, which would mean I am choosing or I choose in a present/ongoing sense.