Complex sentence: James was BTCC champion in both 2002 and 2004, and was 2nd in 2003, before seeking a new challenge in the World Touring Car Championship for 2005 with Alfa Romeo.
Split into simpler sentences: James was BTCC champion in both 2002 and 2004, and was 2nd in 2003. For 2005, Thompson attempted a new challenge in the World Touring Car Championship, with Alfa Romeo.