Complex sentence: As the energy difference between cycles of the device is zero, no work can be done, thus it can never be used, and since energy losses are unavoidable, any such device will cease to operate after a short while, even without any load.
Split into simpler sentences: As the energy difference between cycles of the device is zero, no work can be obtained, thus it can never be used. As energy losses are unavoidable, any such device will cease to move after a short while, even without any load.