Complex sentence: The storyline of the game was meant to pick up right where "Ultima IX" left off, in the story the Guardian and Avatar are now one being, and both the Avatar and Guardian halves are fighting to dominate one another and take control.
Split into simpler sentences: The storyline of the game was meant to pick up right where "Ultima IX" left off. In the story, the Guardian and the Avatar are now one being, and both the Avatar and Guardian halves are fighting to dominate one another and take control.