Complex sentence: He has spent most of his career competing in touring car racing; he was a former factory Vauxhall and Honda driver in the British Touring Car Championship, and currently drives for Sébastien Loeb Racing in the World Touring Car Championship.
Split into simpler sentences: He has spent most of his career competing in the BTCC; he is a former factory Vauxhall and Honda driver. He currently drives for Sébastien Loeb Racing in the World Touring Car Championship.