Complex sentence: A feasibility and system definition study was concluded in January 2007 which recommended the launch of a constellation of optical and Synthetic Aperture Radar (SAR) satellites to ensure that the domestic and international user requirements are competitively met.
Split into simpler sentences: A feasibility and system definition study was concluded in January 2007 which recommended the launch of a constellation of Optical and Synthetic Aperture Radar (SAR). Satellites to ensure that the domestic and international user requirements are competitively met.