Complex sentence: Major Wilson is harshly rebuked by General Harper for allowing Decker to escape but when Air Vice Marshal Mackaye arrives, Wilson immediately asks Mackaye if he has ever known a man named William Terrence Decker.
Split into simpler sentences: Major Wilson is rebuked by General Harper for allowing Decker to escape. When Air Vice Marshal Mackaye arrives, Wilson asks Mackaye if he has ever known a man named William Terrence Decker.