Complex sentence: Alfson requested that he be allowed to sit out his sophomore season, due to the number of experienced players ahead of him; also, he had not attended college until several years after graduating high school, and felt he needed more preparation.
Split into simpler sentences: Alfson requested that he be allowed to sit out his sophomore season due to the number of experienced players ahead of him. In addition, he had not started college until several years after graduating high school, and thus felt he needed more preparation.