Complex sentence: Outmatched, Kadaj opens Jenova's box and fuses with its contents, transforming into Sephiroth who then tells Cloud that he will be able to use the life essences of Geostigma sufferers to achieve complete domination over the planet.
Split into simpler sentences: Outmatched, Kadaj opens Jenova's box and fuses with its contents, transforming into Sephiroth. He then tells Cloud that he will be able to use the life essences of Geostigma sufferers to achieve complete domination over the planet.