Complex sentence: Escaping from the habitat, Johnson goes to the spacecraft and enters presence of the sphere, then the sphere itself, and decides to escape using the submarine docked at Habitat DH-7, a nearby habitat for Navy personnel but cannot abandon the other survivors.
Split into simpler sentences: Escaping from the habitat, Johnson goes to the spacecraft and enters the presence of the sphere, then the sphere itself. He decides to escape using the submarine docked at Habitat DH-7, a nearby habitat for Navy personnel, but cannot abandon the other survivors.