Complex sentence: The electrolyte of the Nickel Iron cells does not enter into chemical combination to perform the functions of the cell, but acts merely as a conveyor; it therefore does not change in specific gravity during charge and discharge other than through evaporation and changes in temperature.
Split into simpler sentences: The electrolyte of the nickel iron cells does not enter into chemical combination to perform the functions of the cell, but acts merely as a conveyor. It does not change in specific gravity during charge and discharge other than through evaporation and changes in temperature.