Complex sentence: He tried to slip past the guards as a large crowd was leaving the premises; when asked on one occasion to seat a wealthy donor's wife, he pretended to misunderstand, instead hurling the chair across the room, just past the woman's head.
Split into simpler sentences: He tried to slip past the guards as a large crowd was leaving the premises. When asked on one occasion to seat a wealthy donor's wife, he pretended to misunderstand, instead hurling the chair across the room, just past the woman's head.