Complex sentence: Thicke had a successful career as a TV theme song composer, often collaborating with his then-wife Gloria Loring on these projects, which included the themes to the popular sitcoms "Diff'rent Strokes" and "The Facts of Life".
Split into simpler sentences: Thicke had a successful career as a TV theme song composer. He often collaborated with his wife Gloria Loring on these projects, which included the themes to the popular sitcoms "Diff'rent Strokes" and "The Facts of Life".