Complex sentence: Bill (played by David Carradine) is the character for whom the movie "Kill Bill" is named and was the leader of the Deadly Viper Assassination Squad, which included Bill's brother, Budd (Michael Madsen).
Split into simpler sentences: Bill (played by David Carradine) is a fictional character for whom the movie "Kill Bill" is named. In the film, he is the leader of the Deadly Viper Assassination Squad, which included his brother, Budd (Michael Madsen).