Complex sentence: His best known titles have been International Karate and its sequel IK +, which he developed for the Commodore 64 but were converted to other systems; his series of snooker and pool games, which commenced with Jimmy White's Whirlwind Snooker in 1991.
Split into simpler sentences: His best known titles are "International Karate" and its sequel, "IK +", which he developed for the Commodore 64 but were ported to other systems. He is also know for his series of snooker and pool games, which commenced with "Jimmy White's Whirlwind Snooker" in 1991.