Complex sentence: The examples on Earth don't have significant amounts of liquid water, unfortunately, but they do have close to 100% humidity inside, and are able to sustain microbial communities of oligotrophs, i.e. micro-organisms that can survive in nutrient poor environments.
Split into simpler sentences: The examples on Earth don't have significant amounts of liquid water, unfortunately. However, they do have close to 100% humidity inside, and are able to sustain microbial communities of oligotrophs, i.e. micro-organisms that can survive in nutrient poor environments.