Complex sentence: In the episode, after having a terrible day at school, Bart stumbles upon the "Legitimate Businessman's Social Club" Mafia bar where the leader, Fat Tony, hires him to work as their permanent bartender.
Split into simpler sentences: In the episode, Bart stumbles upon the Mafia bar Legitimate Businessman's Social Club after having a terrible day at school. The leader of the bar, mobster Fat Tony, hires Bart to work as their permanent bartender.