Complex sentence: He was called on several occasions by then first-team coach Bernd Schuster to train with the seniors and, during the 2006--07 season, he played four matches for Real Madrid Castilla in Segunda División.
Split into simpler sentences: He was called on several occasions by then first-team coach Bernd Schuster to train with the seniors. During the 2006--07 season, he played four matches for Real Madrid Castilla, in the Segunda División.