Complex sentence: The ship's owners, a huge corporation, believe that there are rich deposits of raw materials on this third planet of the system, however the data which describes the planet as a desert, turns out to be forged.
Split into simpler sentences: The ship's owners, a huge corporation, believe that there are rich deposits of raw materials on the third planet of the system. The data which describes the planet as a desert, however, turns out to be forged.