Complex sentence: Serna played nearly 150 competitive games for Barcelona, winning two national championships, two Spanish Cups, one UEFA Cup Winners' Cup and one European Cup, but appeared sparingly in his final season, where he already played alongside former Sevilla defensive teammate Nando.
Split into simpler sentences: Serna played nearly 150 competitive games for Barcelona, winning two national championships, two Spanish Cups, one UEFA Cup Winners' Cup and one European Cup. He appeared sparingly in his final season, where he already played alongside former Sevilla defensive teammate Nando.