Complex sentence: The opera "Donnerstag aus Licht" concerns the development of the earthly life of young Michael, who personifies a divine spirit capable of achieving immortality and absolute knowledge, who discovers beyond death a supraconsciousness that protects him from the anti-knowledge of Lucifer.
Split into simpler sentences: The opera "Donnerstag aus Licht" concerns the development of the earthly life of young Michael. He personifies a divine spirit capable of achieving immortality and absolute knowledge, who discovers beyond death a supraconsciousness that protects him from the anti-knowledge of Lucifer.