Complex sentence: A Terrain Awareness and Warning System (TAWS) was created which alerts the pilot when he is flying too low, software was also developed that calculates real-time fuel consumption data, so the pilot knows how much fuel is left to burn.
Split into simpler sentences: A Terrain Awareness and Warning System (TAWS) was created which alerts the pilot when he is flying too low. Software was also developed that calculates real-time fuel consumption data; so the pilot knows how much fuel is left to burn.