Complex sentence: Butterscotch, who hailed from a working-class background, was an alcoholic failed novelist; he resented his wife's financial independence and took out his insecurities on BoJack.
Split into simpler sentences: Butterscotch, who hailed from a working-class background, was an alcoholic failed novelist. He resented his wife's financial independence and took out his insecurities on BoJack.