Complex sentence: Although she had had bit parts in more than thirty films in the 1930s and 1940s, including Babes in Toyland and It's a Wonderful Life, her first credited acting job was in 1945, playing a maid in RKO's "Cornered".
Split into simpler sentences: Although she had had bit parts in more than thirty films in the 1930s and 1940s, including "Babes in Toyland" and "It's a Wonderful Life". Her first credited acting role was in 1945, playing a maid in RKO's "Cornered".