Complex sentence: As the pad was nearing completion in February 2013, the first Falcon 9 launch was scheduled for summer 2013, but was launched on 29 September 2013, and was the maiden flight of the Falcon 9 v1.1 configuration, carrying Canada's CASSIOPE satellite.
Split into simpler sentences: As the pad was nearing completion in February 2013, the first Falcon 9 launch was scheduled for summer 2013, but was delayed until September 2013. This was the maiden flight of the Falcon 9 v1.1 configuration, carrying Canada's CASSIOPE satellite.