Complex sentence: Since his debut he was an essential defensive unit as the side won, amongst other trophies, six championships, three cups and four super cups; he also appeared in all six group stage matches of the club in its first participation in the UEFA Champions League.
Split into simpler sentences: Since his debut he was an essential defensive player as the side won, amongst other trophies, six championships, three cups and four super cups. He also appeared in all six group stage matches of the club in its first participation in the UEFA Champions League.