Complex sentence: He was the Minister of State for Foreign and Commonwealth Affairs until July 2014, and was previously the Minister for Sport and for the Olympics and was the Minister with day-to-day responsibility for the 2012 London Olympic and Paralympic Games.
Split into simpler sentences: He was the Minister of State for Foreign and Commonwealth Affairs until July 2014, having previously been the Minister for Sport and for the Olympics. As such, he was the Minister with day-to-day responsibility for the 2012 London Olympic and Paralympic Games.