Complex sentence: With the aid of a storm giant, they must discover the plot behind these raids which was set both on the floating sea city of Kron and an undersea city inhabited by tritons and involves an ancient evil in the sunken city of Colhador.
Split into simpler sentences: With the aid of a storm giant, they must discover the plot behind these raids. Set both on the floating sea city of Kron and an undersea city inhabited by tritons, it involves an ancient evil in the sunken city of Colhador.