Complex sentence: When Zeratul reached the final stasis cell, however, he sees that the Hybrid had been perfected, and soon after realizing this Duran appears and tells his story of how he works for a greater power and that his creation will bring order to the sector.
Split into simpler sentences: When Zeratul reached the final stasis cell, however, he saw that the hybrid had already been completed. Soon after realizing this, Duran appears, claiming that he works for a greater power and that his creation will bring order to the sector.