Complex sentence: Warwick was an official training venue for the London 2012 Olympics: during the Games, some football matches were played at the nearby Ricoh Arena, home of Coventry City Football Club, and Warwick provided training and residential facilities for the Olympic teams.
Split into simpler sentences: Warwick was an official training venue for the London 2012 Olympics. During the Games, some football matches were played at the nearby Ricoh Arena, home of Coventry City Football Club, and Warwick provided training and residential facilities for the Olympic teams.