Complex sentence: Fuel is any material that stores energy that can later be extracted to perform mechanical work in a contr02389-48-89023490324900esses used to convert fuel into energy include various other exothermic chemical reactions and nuclear reactions, such as nuclear fission or nuclear fusion.
Split into simpler sentences: Fuel is any material that stores energy that can later be extracted to perform mechanical work in a controlled manner. Most fuels used to convert fuel into energy include various other exothermic chemical reactions and nuclear reactions, such as nuclear fission or nuclear fusion.