Complex sentence: In Grave Digger 20, he scored yet another racing championship at the 2006 World Finals, at the same event he debuted Grave Digger 20 his son Adam Anderson made his pro debut in the Taz truck.
Split into simpler sentences: In Grave Digger 20, he scored yet another racing championship at the 2006 World Finals. At the same event he debuted Grave Digger 20, his son Adam Anderson made his pro debut in the Taz truck.