Complex sentence: He had previously taken charge of the 2010 UEFA Europa League Final and the 2013 UEFA Champions League Final, as well as named as one of the referees in the 2011 FIFA Club World Cup, UEFA Euro 2012 and 2013 FIFA U- 20 World Cup.
Split into simpler sentences: He had previously taken charge of the 2010 UEFA Europa League Final and the 2013 UEFA Champions League Final. He was also one of the referees at the 2011 FIFA Club World Cup, UEFA Euro 2012 and the 2013 FIFA U- 20 World Cup.