Complex sentence: BMC merged with Jaguar to become BMH in 1966 and was merged into British Leyland in 1968, and in 1970 Healey became chairman of Jensen Motors with the enthusiastic backing of key US based Austin-Healey distributors.
Split into simpler sentences: BMC merged with Jaguar to become BMH in 1966 and was merged into British Leyland in 1968. In the wake of these organisational changes, in 1970 Healey became chairman of Jensen Motors with the enthusiastic backing of key US based Austin-Healey distributors.