Complex sentence: Walter soon throws a party to celebrate his success, but becomes furious when given senior critic, John Canady's, scathing review and angrily confronts him during the party about the supposed emotion that was put in the painting.
Split into simpler sentences: Walter soon throws a party to celebrate his success, but becomes furious when he reads a scathing review. He angrily confronts him during the party about the emotion that was put in the painting.