Complex sentence: Used to his outrageous life-of-the-party humor, they all mistakenly thought he was joking, and Woroniecki became the unwitting focus of ridicule and rejection by his teammates.
Split into simpler sentences: Used to his outrageous life-of-the-party humor, they all mistakenly thought he was joking. Accustomed to being the center of attention, Woroniecki became the unwitting focus of ridicule and rejection by his teammates.