Complex sentence: The storyline of original "Diablo II" progresses through four acts, with each act following a more or less predetermined path, although there is some random-level generation in wilderness areas and dungeons between key cities.
Split into simpler sentences: The storyline of original "Diablo II" progresses through four chapters or acts. Each act following a more or less predetermined path, although there is some random-level generation in wilderness areas and dungeons between key cities.