Answer:
Revision
Explanation:
During the revision process you are going over your draft and changing things.
My brother (he has read hundreds of books on the subject) told me that the samurai lived by a strict code of honor.
Parenthetical phrases that interrupt a sentence are not to be capitalized unless they start with a proper noun. They also should not have ending punctuation inside the parentheses. Although the phrase inside the parentheses could qualify as a full clause on its own, in parentheses it is merely a phrase which interrupts the actual sentence by adding additional information, and should therefore not be treated as its own sentence grammatically.