Complex sentence: Cooper became the official tire of the A1 Grand Prix, dubbed the World Cup of Motorsports, for the series' initial 2005-2006 season and was under contract to produce slick tires and treaded rain tires for the series championship until 2008.
Split into simpler sentences: Cooper became the official tire of the A1 Grand Prix, dubbed the World Cup of Motorsports, for the series' initial 2005-2006 season. Cooper was under contract to produce slick tires and treaded rain tires for the series championship until 2008.