Complex sentence: It made a departure from the original by binding the stories behind the four parts of the cycle with a surrealist science fiction surrounding a being by the name of Ish, who guided by a voice (played by Charlotte Rampling) discovers the story of the Nibelungen.
Split into simpler sentences: It made a departure from the source material by binding the stories behind the four parts of the cycle with a surrealist science fiction background. The main ploit involves a being by the name of Ish, who is guided by a voice (played by Charlotte Rampling), and who discovers the story of the Nibelungen.