Complex sentence: Lubitsch did not received screen credit for his writing, and one of the writers credited, Grover Jones did not contribute significantly: although he was in the room, his credit was based on a contractual obligation, and he did little more than tell stories.
Split into simpler sentences: Lubitsch did not received screen credit for his writing, and one of the writers credited, Grover Jones did not contribute significantly. Although he was in the room, his credit was based on a contractual obligation, and he did little more than tell stories.