Complex sentence: In the off-season, Desjardins was traded to the Québec Remparts, as a 20-year old player, meaning it was his last year in the QMJHL.
Split into simpler sentences: In the off-season, Desjardins was traded to the Québec Remparts. As a 20-year old player that meant it was his last year in the QMJHL.