Complex sentence: One of her best roles was Becky Thatcher in David O. Selznicks "The Adventures of Tom Sawyer" (1938), she also provided the voice for Faline as an adult in "Bambi" (1942).
Split into simpler sentences: One of her best roles was Becky Thatcher in David O. Selznicks "The Adventures of Tom Sawyer" (1938). She also provided the voice of Faline as an adult in "Bambi" (1942).