Complex sentence: The fuel system is designed to control and govern the engine under all operating conditions and to provide safeguards against malfunctions, the pilot selecting rotor speed and the governing element automatically maintaining the rotor speed within close limits under varying conditions of load.
Split into simpler sentences: The fuel system is designed to control and govern the engine under all operating conditions and to provide safeguards against malfunctions. The pilot can select rotor speed and the governing element will automatically maintain this to within close limits under varying conditions of load.