Complex sentence: The LSAM would be much larger than the Apollo Lunar Module and would be capable of carrying up to 23 tons of cargo to the lunar surface to support a lunar outpost (this weight in cargo is greater than the mass of the entire Apollo LM).
Split into simpler sentences: The LSAM would be much larger than the Apollo Lunar Module and would be capable of carrying up to 23 tons of cargo to the lunar surface to support a lunar outpost. This weight in cargo is greater than the mass of the entire Apollo Lunar Module (LM).