Complex sentence: Wasserfall was essentially an anti-aircraft development of the V2 rocket, sharing the same general layout and shaping, but being about 1/4 the size and including an additional set of fins located at the middle of the fuselage to provide extra lift while manuvering.
Split into simpler sentences: Wasserfall was essentially an anti-aircraft development of the V2 rocket, sharing the same general layout and shaping. The Wasserfall design also included an additional set of fins located at the middle of the fuselage to provide extra lift while manuvering.