Complex sentence: At Olympia, Percy, Leo, Hazel, and Frank, who are forced to participate in Nike's deadly Olympic Games, capture and detain her, who reveals about the "Physician's Cure" and its ingredients.
Split into simpler sentences: At Olympia, Percy, Leo, Hazel, and Frank, who are forced to participate in Nike's deadly Olympic Games, capture and detain her. Coerced, she reveals about the "Physician's Cure" and its ingredients.