Complex sentence: The woman (Claire) sits down with the rest of the gang as they explain the events that lead up to that night Barny and Robin were coping with the end of their relationship in their own different ways.
Split into simpler sentences: The woman (Claire) sits down with the rest of the gang as they explain the events that lead up to that night. Barney and Robin were coping with the end of their relationship in their own different ways.