Complex sentence: The first feature film, "Superman and the Mole Men", starring George Reeves, was released in 1951, and was intended to promote the first television series, which aired from 1952 to 1958.
Split into simpler sentences: The first feature film, "Superman and the Mole Men", starring George Reeves, was released in 1951. Reeves then starred in the first television series, which aired from 1952 to 1958.