Complex sentence: Generally, however, to realize the extreme high capacitance values of supercapacitors the electrodes have to have the largest possible surface at the smallest volume, because the double-layer capacitance as well as the pseudocapacitance is surface area dependent.
Split into simpler sentences: Generally, however, to realize the extreme high capacitance values of supercapacitors the electrodes have to have the largest possible surface at the smallest volume. This is essential for electrochemical capacitors because the double-layer capacitance as well as the pseudocapacitance is surface area dependent.