Complex sentence: This includes analogues of subsurface habitat, or of temporary habitats that can form after volcanic eruptions and large meteorite impacts, but leaves out sites that are thought to be analogues only of conditions on early Mars.
Split into simpler sentences: This includes analogues of deep subsurface habitats, and temporary habitats that can form after volcanic eruptions and large meteorite impacts. However, it leaves out sites that are thought to be analogues only of conditions on early Mars.