Complex sentence: Most of these rooms have been ransacked by a variety of other survivors, human and monsterous, who are likewise trapped within the labyrinth and either eking out a miserable existance there or else are desparately searching for a means of escape.
Split into simpler sentences: Most of these rooms have been ransacked by a variety of other survivors, human and monsterous. These survivors are likewise trapped within the labyrinth and are either eking out a miserable existance there or else desparately searching for a means of escape.