Complex sentence: In the 1950s, now an independent producer rather that a studio employee, he worked on musicals and other films including "Oklahoma", "Ruggles of Red Gap" and "Gaslight".
Split into simpler sentences: In the 1950s, now an independent producer rather that a studio employee, he worked on musicals and other films. Notably "Oklahoma", "Ruggles of Red Gap" and "Gaslight".