Complex sentence: Aside from his acting career, Phoenix has also ventured behind the camera, directing music videos as well as producing movies and television shows, and has recorded an album, the soundtrack to "Walk the Line" for which he won a Grammy Award.
Split into simpler sentences: Aside from his acting career, Phoenix has also ventured into directing music videos, as well as producing movies and television shows. He has recorded an album, the soundtrack to Walk the Line, for which he won a Grammy Award.