Answer:
The best way to rewrite sentence 2 is: Despite his nerves, he was ready for his first interview; he had thought through each potential question.
Explanation:
To rewrite sentence 2 in order to make it more accurate we can add punctuation marks, in this case, we use a comma and semicolon.
One of the uses of the comma is after a dependent clause which is starting a statement, Despite his nerves is a dependent clause since it doesn't have enough information to communicate a message by itself.
Semicolons can be used as a substitute of a comma followed by the word and, we are connecting two sentences that make reference to the same subject and have parallel, instead of using words as connectors we use a semicolon.