Complex sentence: She won the Academy Award for Best Supporting Actress for her performance as Lynn Bracken in the 1997 film "L.A. Confidential"; as well as, the Golden Globe for Best Supporting Actress and the SAG Award for Best Supporting Actress.
Split into simpler sentences: She won the Academy Award for Best Supporting Actress for her performance as Lynn Bracken in the 1997 film "L.A. Confidential". For her role in "L.A. Confidential", she also won the Golden Globe for Best Supporting Actress and the SAG Award for Best Supporting Actress.