Complex sentence: These include Darts, Skittles (a British version of Bowling), 8-ball (both the England and US version), and an Arcade Game, which is similar to Snake; however, as the levels get harder, things will change.
Split into simpler sentences: These include Darts, Skittles (a British version of Bowling), 8-ball (both the England and US version), and an Arcade Game. Except, as the levels get harder, things will change.