Complex sentence: He started out as a child actor in the late 1950s before starting his film career as an adult in 1971 acting in over 100 films through to his death at the age of 45 in 1990.
Split into simpler sentences: He started out as a child actor in the late 1950s before starting his film career as an adult in 1971. He acted in over 100 films through to his death at the age of 45 in 1990.