Complex sentence: They soon hear of of an unknown Queen of the Slayers who is getting a number of the fresh slayers to form a mystical army, this likely evil seems determined to claim the slayer essence for herself.
Split into simpler sentences: They soon hear of an unknown "Queen of the Slayers" who is getting a number of the fresh slayers to form a mystical army. This likely evil seems determined to claim the slayer essence for herself.