Complex sentence: They are led to a hidden valley occupied by what they name "The Metal Monster", a strange metal city occupied by the metal animate Things Norhala commands This city is governed by what they call the Metal Emperor, assisted by the Keeper of the Cones.
Split into simpler sentences: They are led to a hidden valley occupied by what they name "The Metal Monster", a strange metal city occupied by the strange metal animate Things Norhala commands. The city is governed by what they call the Metal Emperor, assisted by the Keeper of the Cones.