Complex sentence: She was one of the most prominent stars during the silent film era as both an actress and a fashion icon, especially under the direction of Cecil B. DeMille, making dozens of silent films and being nominated for the first Academy Award in the Best Actress category.
Split into simpler sentences: She was one of the most prominent stars during the silent film era as both an actress and a fashion icon, especially under the direction of Cecil B. DeMille. She starred in dozens of silent films and was nominated for the first Academy Award in the Best Actress category.