Complex sentence: Although his intentions are pure and beneficial, his lust for power drives him to the brink of madness and his experiments become more perverse, resulting in him unleashing a deadly weapon upon his home world of Corneria.
Split into simpler sentences: Although his intentions are originally pure and beneficial, his lust for power drives him to the brink of madness. The increasing perversion of his experiments results in his unleashing of a deadly weapon upon his home world of Corneria.