Complex sentence: Falcon 9 Flight 20 was the first launch of the substantially upgraded Falcon 9 v1.1 Full Thrust launch vehicle and carried 11 Orbcomm-OG2 satellites to Earth orbit.
Split into simpler sentences: Falcon 9 Flight 20 was the first launch of the substantially upgraded Falcon 9 full thrust version of the Falcon 9 launch vehicle. It carried 11 Orbcomm-OG2 satellites to Earth orbit.