Complex sentence: Several of his fellow WTCC drivers have carried stickers on their cars in the 2010 WTCC season to promote a website which is trying to find a suitable bone marrow donor., the GT Association and all teams of Super GT also launches a campaign towards bone marrow donation.
Split into simpler sentences: Several of his fellow WTCC drivers have carried stickers on their cars in the 2010 WTCC season to promote a website which is trying to find a suitable bone marrow donor. The GT Association and all teams of Super GT also launched a campaign towards bone marrow donation.