ההסבר שלה היה ברור מאוד, ולכן גם החלק הקשה נעשה מובן יותר.

Because הסבר is a masculine singular noun in Hebrew.

So:

• ההסבר = the explanation
• היה = was for a masculine singular subject

Even though שלה means hers, the verb agrees with ההסבר, not with the person who owns it.

So the grammar is:

• ההסבר שלה היה ברור מאוד = Her explanation was very clear

If the noun were feminine, you would use הייתה instead.

In Hebrew, possessive phrases like her explanation, his book, their car are very often formed with של plus a pronoun, and this comes after the noun.

So:

• ההסבר שלה = literally the explanation of hers
• natural English translation: her explanation

This is one of the most common differences from English word order.

Some examples:

• הספר שלי = my book
• המורה שלהם = their teacher
• הבית שלה = her house

So שלה after the noun is completely normal.

הסבר means explanation.
The extra ה at the beginning is the Hebrew definite article, meaning the.

So:

• הסבר = an explanation / explanation
• ההסבר = the explanation

The sentence uses ההסבר שלה, literally the explanation of hers, which is the normal way to say her explanation.

ברור means clear.
מאוד means very.

So:

• ברור מאוד = very clear

In Hebrew, מאוד usually comes after the adjective or adverb it modifies.

Examples:

• טוב מאוד = very good
• קשה מאוד = very difficult
• ברור מאוד = very clear

This is different from English, where very comes before the adjective.

Yes. ולכן is made of:

• ו־ = and
• לכן = therefore / so

Together, ולכן means and therefore, and so, or so depending on context.

In this sentence, it connects the first idea to the result:

• Her explanation was very clear, and therefore / so...

It sounds slightly more formal or structured than just אז in many contexts.

גם means also / too / even.

Here it modifies החלק הקשה:

• ולכן גם החלק הקשה...
• and therefore even/also the difficult part...

It adds the idea that not only was the explanation clear, but even the difficult part became easier to understand.

In this sentence, גם has a sense close to even in English, because it highlights something surprising: the difficult part became more understandable too.

Because the phrase means the difficult part, not a difficult part.

In Hebrew, if the noun is definite, the adjective must also be definite.

So:

• חלק קשה = a difficult part
• החלק הקשה = the difficult part

Notice that both words get ה:

• החלק
• הקשה

This is a basic rule in Hebrew adjective agreement.

Because in Hebrew, adjectives usually come after the noun they describe.

So:

• החלק הקשה = literally the part difficult
• natural English: the difficult part

More examples:

• ספר טוב = a good book
• ילד קטן = a small boy
• מכונית חדשה = a new car

This is standard Hebrew word order.

Here, נעשה means became rather than was done.

The verb comes from the root ע-ש-ה and in this form it can mean:

• was done / was made
• or became

In this sentence:

• נעשה מובן יותר = became more understandable

So the idea is not that someone did the difficult part, but that the difficult part turned into something more understandable.

That is a very common use of נעשה in Hebrew.

Examples:

• זה נעשה ברור = it became clear
• המצב נעשה מסובך = the situation became complicated

They are related, but not identical.

• ברור = clear
• מובן = understood / understandable

In many contexts they overlap, but the nuance is slightly different:

• ההסבר היה ברור מאוד = the explanation was very clear
• החלק הקשה נעשה מובן יותר = the difficult part became more understandable

So the first part talks about the clarity of the explanation, and the second part talks about the listener’s ability to understand the difficult part.

That choice sounds natural and stylistically nice in Hebrew.

יותר means more.

In Hebrew comparatives, יותר usually comes after the adjective:

• מובן יותר = more understandable
• ברור יותר = clearer
• קשה יותר = more difficult

So the pattern is:

• adjective + יותר

This is different from English, where more usually comes before the adjective.

Historically and grammatically, מובן is a participial form, but in everyday Hebrew it often behaves very much like an adjective.

Here it means understood / understandable, and in this sentence it functions like a descriptive word after נעשה:

• נעשה מובן יותר = became more understandable

For learners, the most useful way to read it here is simply as a descriptive word meaning understandable.

The sentence has two linked parts:

1. ההסבר שלה היה ברור מאוד
   = Her explanation was very clear

2. ולכן גם החלק הקשה נעשה מובן יותר
   = and therefore even the difficult part became more understandable

So the logic is:

• clear explanation
• therefore
• better understanding of the difficult part

It is a very natural Hebrew sentence with a cause-and-result structure.