Complex sentence: In his second season at Barça, the club retained the La Liga title and won the 2009 FIFA Club World Cup, and in the 2010--11 season, Alves was instrumental in Barcelona's winning of their third consecutive Liga title.
Split into simpler sentences: In his second season at "Barça", the club retained the Liga title and won the 2009 FIFA Club World Cup. In the 2010--11 season, Alves was instrumental in Barcelona's winning of their third consecutive Liga title.