Complex sentence: Brix and Bora are on Earth-999 killing a cat with Spider-Man's powers; on Earth-7831, Daimos kills Spider-Man and several of the animalistic residents of Counter-Earth.
Split into simpler sentences: Brix and Bora are on Earth-999 killing a cat with Spider-Man's powers. On Earth-7831, Daimos kills Spider-Man and several of the animalistic residents of Counter-Earth.