Complex sentence: With the aid of a Necromancer, they expose his treachery to the King and find an ancient map on which Place Which is No More is the'High Places of Korim', an ancient temple of Torak.
Split into simpler sentences: With the aid of a Necromancer, they expose his treachery to the King and find the ancient map. The Place Which is No More is revealed to be the High Places of Korim, an ancient temple of Torak.