Complex sentence: Before its North American release, gameplay footage from "Super Mario Bros.3" appeared in the Universal Studios film "The Wizard", which helped to fuel anticipation amongst fans; however, the game was already available in some PlayChoice-10 machines.
Split into simpler sentences: Before its North American release, gameplay footage from "Super Mario Bros.3" appeared in the Universal Studios film "The Wizard", which helped to fuel anticipation amongst fans. However, the game was already available in some PlayChoice-10 machines.