Complex sentence: The satelitte was to test various new technologies including the GPS-aided geo-augmented navigation syhad been successful, then GSAT-4 would have been one of the heaviest satellites launched by India.
Split into simpler sentences: The satelitte was to test various new technologies including the GPS-aided geo-augmented navigation system. If the launch had been successful, then GSAT-4 would have been one of the heaviest satellites launched by India.