Complex sentence: More recently, on the International Space Station, the Zvezda module includes a humidity control system, the water it collects is usually used to supply the Elektron system that electrolyses water into hydrogen and oxygen, but it can be used for drinking in an emergency.
Split into simpler sentences: More recently, on the International Space Station, the Zvezda module includes a humidity control system. The water it collects is usually used to supply the Elektron system that electrolyses water into hydrogen and oxygen, but it can be used for drinking in an emergency.