Complex sentence: This punch led to a much more confident George, Biff's defeat also improve George's reputation in school, and he would repeatedly outwit Biff later on thus, he no longer had a victim to do all his work for him.
Split into simpler sentences: This punch led to a much more confident George, and Biff's defeat also improve George's reputation in school. George would repeatedly outwit Biff later on thus, he no longer had a victim to do all his work for him.