Complex sentence: The winners will play against the winners of the 2014--15 UEFA Europa League in the 2015 UEFA Super Cup, and also enter the semi-finals of the 2015 FIFA Club World Cup as the UEFA representative.
Split into simpler sentences: The winners will earn the right to play against the winners of the 2014--15 UEFA Europa League in the 2015 UEFA Super Cup. They will also qualify to enter the semi-finals of the 2015 FIFA Club World Cup as the UEFA representative.