Complex sentence: The score, notable for pioneering the use of the theremin, was immensely successful and won him his first Oscar, against two of his other scores, "The Lost Weekend" and "A Song to Remember", which were also nominated that year.
Split into simpler sentences: The score, notable for pioneering the use of the theremin, was immensely successful and earned him his first Oscar. Two of his other scores, "The Lost Weekend" and "A Song to Remember", which were also nominated that year.