Complex sentence: John Joseph "Jack" MacGowran (October 13,1918--January 31,1973) was an Irish character actor, whose last film role was as the alcoholic director Burke Dennings in "The Exorcist".
Split into simpler sentences: John Joseph "Jack" MacGowran (October 13,1918--January 31,1973) was an Irish character actor. His last film role was as the alcoholic director Burke Dennings in "The Exorcist".