Complex sentence: Boateng has since accumulated over 60 caps and represented Germany at UEFA Euro 2012, UEFA Euro 2016,2010 World Cup, and 2014 World Cup, the latter of which he was a key member of his country's victory.
Split into simpler sentences: Boateng has since accumulated over 60 caps and represented Germany at UEFA Euro 2012, UEFA Euro 2016,2010 World Cup, and 2014 World Cup. The latter of which he was a key member of his country's victory.