אם יש טעות בתשובה, אפשר לתקן אותה.

אם means if here, and it introduces a condition:

אם יש טעות בתשובה = If there is a mistake in the answer

A very common thing for learners to know is that אם can also mean whether in other sentences, but in this sentence it is clearly the conditional if.

יש is the usual way to say there is / there are in Hebrew.

So:

• יש טעות = there is a mistake
• אם יש טעות = if there is a mistake

This is important because Hebrew does not normally use a present-tense form of to be the way English does. So instead of something like if a mistake is, Hebrew uses if there is a mistake with יש.

Because טעות here means a mistake, not the mistake.

• טעות = a mistake / mistake
• הטעות = the mistake

So יש טעות means there is a mistake, which sounds natural in a general conditional statement.

בתשובה means in the answer or sometimes in an answer, depending on context.

It is made from the preposition ב־ (in) attached to תשובה (answer).

A useful thing to know is that in normal unpointed Hebrew writing, בתשובה can represent either:

• בְּתשובה = in an answer
• בַּתשובה = in the answer

They are written the same without vowel marks, so context tells you which one is meant. In this sentence, learners are very likely meant to understand in the answer.

אפשר is a very common impersonal Hebrew word meaning:

• it is possible
• one can
• you can

So:

אפשר לתקן אותה literally means something like it is possible to correct it, but in natural English that often becomes you can correct it.

Hebrew often prefers this impersonal style where English would use you can.

Because אפשר is followed by an infinitive.

• לתקן = to correct / to fix

So:

• אפשר לתקן = it is possible to correct / you can correct

This pattern is extremely common in Hebrew:

• אפשר לראות = you can see
• אפשר לעשות = you can do
• אפשר לתקן = you can correct

אותה is a feminine singular direct object pronoun, meaning her or it.

In this sentence, it means it.

The interesting thing is that it could grammatically refer to either of these feminine nouns:

• טעות = mistake
• תשובה = answer

So the sentence is slightly ambiguous on the surface. Depending on how you understand it, אותה could mean:

• correct the mistake
• correct the answer

In real context, people usually understand the intended meaning easily.

Because אותה already is the direct object pronoun.

With a full noun, Hebrew often uses את before a definite direct object:

• לתקן את התשובה = to correct the answer
• לתקן את הטעות = to correct the mistake

But with object pronouns such as אותו / אותה / אותם / אותן, you do not add a separate את:

• לתקן אותה = to correct it
• not לתקן את אותה in this meaning

So אותה is enough by itself.

Because it refers to a feminine noun.

Both טעות and תשובה are feminine nouns, so the pronoun must also be feminine singular:

• טעות → אותה
• תשובה → אותה

If the noun were masculine, Hebrew would use אותו instead.

It has two parts:

אם יש טעות בתשובה,
= If there is a mistake in the answer,

אפשר לתקן אותה.
= it is possible to correct it / you can correct it.

So the structure is:

condition + result

This is a very common Hebrew sentence pattern:

• אם... , אפשר...
• If... , you can...

The comma separates the if-clause from the main clause, just as in English:

אם יש טעות בתשובה, אפשר לתקן אותה.

It helps readability and is standard punctuation here.
In very informal writing, punctuation may be less careful, but with this structure, the comma is normal and helpful.

Yes, that is a very reasonable translation.

Because אפשר לתקן אותה is somewhat impersonal, English can express it in more than one natural way:

• you can correct it
• it is possible to correct it
• it can be corrected

All of these fit the Hebrew well, depending on the style of English translation you want.