Complex sentence: He claims that the universe is expanding into areas of the Negative Zone, making the universe now rightfully his territory; his forces destroyed the Kyln, an intergalactic power station and maximum security prison, and the planet Xandar, headquarters of the Nova Corps.
Split into simpler sentences: He claims that the universe is expanding into areas of the Negative Zone, making the universe now rightfully his territory. His forces destroyed the Kyln, an intergalactic power station and maximum security prison, and the planet Xandar, headquarters of the Nova Corps.