Complex sentence: After questioning the child's sacked nurse, Tredwell and Miss Collins, Poirot concludes his investigation and confronts Marcus Waverly, who had kidnapped his own son to get money from his rich but very careful wife.
Split into simpler sentences: After questioning the child's sacked nurse, Tredwell and Miss Collins, Poirot concludes his investigation and confronts Mr. Waverly. He' kidnapped' his own son to get money from his rich but very careful wife.