Complex sentence: However, M. Thénardier tries to swindle more money out of Valjean; he runs after them and tells Valjean that he has changed his mind and wants Cosette back.
Split into simpler sentences: However, M. Thénardier tries to attempt to swindle more money out of Valjean. He runs after them and tells Valjean that he has changed his mind and wants Cosette back.