Complex sentence: His contract there ran until the 2007--2008 season, and his premieres included a new version of Mussorgsky's "Boris Godunov", revised and reorchestrated by Igor Buketoff.
Split into simpler sentences: His contract there ran until the 2007--2008 season. His premieres there included a new version of Mussorgsky's "Boris Godunov", revised and reorchestrated by Igor Buketoff.