Complex sentence: Demande manages to obtain the Silver Crystals of the present and the future and is about to bring them together but Sailor Pluto stops time to prevent the universe being destroyed by this act, leading to her own death.
Split into simpler sentences: Demande manages to obtain the Silver Crystals of the past and the future. He is about to bring them together, but Sailor Pluto stops time to prevent the universe from being destroyed by this act, leading to her own death.