Complex sentence: There were no fuel flow mechanics, no control surfaces, and no other celestial bodies.later versions added additional planets and moons, ad well as the ability to load and save collections of parts, known as "subassemblies".
Split into simpler sentences: There were no fuel flow mechanics, no control surfaces, and no other celestial bodies. Later versions added additional planets and moons, as well as the ability to load and save collections of parts, known as "subassemblies".