The base camps are rudimentary campsites on Mount Everest that are used by mountain climbers during their ascent and descent; they are also visited by tourists.
They are used as bases by mountain climbers.
They are used as bases by mountain climbers.
Make this text less complex: The base camps are rudimentary campsites on Mount Everest that are used by mountain climbers during their ascent and descent; they are also visited by tourists. Output: