Complex sentence: He was Chief Conductor of the Zagreb Philharmonic Orchestra from 1990 to 1996 and became Principal Conductor of the Opéra National de Lyon at the beginning of the 2008/09 season.
Split into simpler sentences: He was Chief Conductor of the Zagreb Philharmonic Orchestra from 1990 to 1996. He is the principal conductor of the Opéra National de Lyon from the beginning of the 2008/09 season.