Complex sentence: The urgent need to complete the program without delay dictated a location with good, year-round flying weather, and the risks inherent in the radical new technology to be demonstrated on the aircraft dictated a spacious landing field.
Split into simpler sentences: The urgent need to complete the program without delay dictated a location with good, year-round flying weather. And the risks inherent in the radical new technology to be demonstrated on the aircraft dictated a spacious landing field.