Complex sentence: Sihanouk had an independent artistic career during his lifetime; in addition to writing several musical compositions, Sihanouk also produced, directed and acted in a total of 50 films between 1966 and 2006.
Split into simpler sentences: Sihanouk had an independent artistic career during his lifetime, and wrote several musical compositions. He was also known to be a film producer, director and actor, and produced a total of 50 films between 1966 and 2006.