Complex sentence: Gerald Drayson Adams (June 25,1900-August 23,1988) was a former business executive and literary agent when he began writing for films in the 1940s.
Split into simpler sentences: Gerald Drayson Adams (June 25,1900-August 23,1988) was a film screenwriter. Adams was a former business executive and literary agent before he began writing for films in the 1940s.