Complex sentence: Sorras was often troubled by a knee injury that had kept him out of many games ans seasons, finally after a further reconstruction in 1996 of the right knee, Sorras decided to retire shortly after the 1996-97 National League season.
Split into simpler sentences: Sorras was often troubled by a knee injury that had kept him out of many games throughout the season. Finally after a further reconstruction in 1996 of the right knee, Sorras decided to retire shortly after the 1996-97 National League season.