Paragraf başı çok içeride kalınca, metin anlaşılmıyor.

Because this is a common Turkish noun compound.

• paragraf = paragraph
• baş = head, beginning
• paragraf başı = the beginning of a paragraph / paragraph start / paragraph indent area

In Turkish, compounds like this often use the pattern:

• first noun: bare form
• second noun: with -(s)I third-person possessive ending

So:

• kitap kapağı = book cover
• masa ayağı = table leg
• paragraf başı = paragraph beginning

Here, başı does not mean his/her head. It is just the normal compound form.

Here it most likely refers to the indentation at the beginning of a paragraph, not just the abstract idea of the start of a paragraph.

In formatting and writing contexts, paragraf başı can mean:

• the start of a paragraph
• the first line area
• the paragraph indent

So in this sentence, it is talking about the paragraph opening being pushed too far inward.

içeride means inside / on the inside / inward / indented in depending on context.

It comes from:

• içeri = inside, inward
• -de = in / at / on

So içeride kalmak literally means to remain inside or to stay inward.

In a formatting context, çok içeride kalmak means something like:

• to be too far in
• to sit too far inward
• to be too deeply indented

So the sentence is describing the paragraph start as being too far from the left margin.

Kalınca comes from the verb kalmak and the suffix -ınca / -ince.

• kalmak = to stay, remain
• kalınca = when it stays / when it remains / once it is

In this sentence, çok içeride kalınca means:

• when it stays too far inside
• if it ends up too far indented
• when it is too far inward

The suffix -ınca often gives a meaning like:

• when
• once
• whenever
• if, in context

So the first part of the sentence is a subordinate clause:
When the paragraph start is too far indented...

Because çok içeride kalınca is the dependent clause, and metin anlaşılmıyor is the main clause.

Structure:

• çok içeride kalınca = when it is too far inside
• metin anlaşılmıyor = the text is not understood / the text is hard to understand

The comma separates the condition/circumstance from the result.

This is very natural in Turkish, especially when a clause with -ınca comes first.

Turkish often prefers an impersonal or passive-like structure where English might use a general subject like people.

• metni anlamıyorlar = people do not understand the text
• metin anlaşılmıyor = the text is not understood / the text is hard to understand

Here, anlaşılmak is the passive form of anlamak:

• anlamak = to understand
• anlaşılmak = to be understood

So metin anlaşılmıyor literally means the text is not being understood, but in natural English it often comes out as:

• the text is hard to understand
• the text becomes unclear
• the text is not understandable

This kind of phrasing is very common in Turkish.

It can be broken down like this:

• anla- = understand
• -ş- = part of the verb stem here
• -ıl- = passive
• -mıyor = negative present continuous

So:

• anlaşılıyor = it is understood / it is understandable
• anlaşılmıyor = it is not understood / it is not understandable

Even though -yor is often taught as the present continuous, in Turkish it is also commonly used for general present situations, especially in everyday speech.

So here it does not have to mean something happening right this second. It can also mean:

• is not understood in general
• does not come across clearly

Turkish does not have articles like the or a/an.

So:

• metin can mean text, a text, or the text
• paragraf başı can mean paragraph start, the paragraph start, or a paragraph indent

Which one sounds best in English depends on context.

That is normal in Turkish. Definiteness is often understood from the situation rather than marked with a separate word.

Yes. The thing that is staying too far inside is paragraf başı.

So the sentence works like this:

• Paragraf başı çok içeride kalınca = when the paragraph start/indent is too far inward
• metin anlaşılmıyor = the text is not understood

Turkish does not need to repeat the subject in the second clause unless it is necessary.

Because çok modifies the idea of being inward/inside.

• çok içeride = too far inside / very far inward

This is the natural position in Turkish: the degree word comes before what it modifies.

Compare:

• çok güzel = very beautiful
• çok zor = very difficult
• çok içeride = too far inward / very far inside

In this sentence, çok helps express excess: the paragraph start is not just inward, but too inward.

Yes. A very literal translation would be something like:

• When the paragraph start remains too far inside, the text is not understood.

But more natural English versions might be:

• If the paragraph indent is too deep, the text becomes hard to read.
• When the paragraph start is too far indented, the text is hard to understand.
• If the first line is indented too much, the text is unclear.

So even if the Turkish wording is fairly direct, the best English translation may sound a little freer.