Complex sentence: Robeson next appeared as Othello at the Savoy Theatre before becoming an international cinematic star in roles in "Show Boat" and "Sanders of the River", he became increasingly attuned towards the sufferings of all cultures and peoples.
Split into simpler sentences: Robeson next appeared as Othello at the Savoy Theatre before becoming an international cinematic star through roles in "Show Boat" and "Sanders of the River". He became increasingly attuned towards the sufferings of all cultures and peoples.