Complex sentence: Amos's first television role was in an episode of long-running sit-com "Men Behaving Badly", playing the part of Mandy, the annoying girlfriend of Tony's brother, in the episode "People Behaving Irritatingly".
Split into simpler sentences: Amos's first notable TV role was in an episode of long-running sit-com "Men Behaving Badly". She played the part of Mandy, the annoying girlfriend of Tony's brother in the episode "People Behaving Irritatingly".