Complex sentence: In internally equalized valves, the evaporator pressure against the diaphragm is the pressure of the outlet of the expansion valve, whereas in externally equalized valves, the evaporator pressure against the diaphragm is the pressure of the outlet of the evaporator.
Split into simpler sentences: In internally equalized valves, the evaporator pressure against the diaphragm is the pressure of the outlet of the expansion valve. Whereas in externally equalized valves, the evaporator pressure against the diaphragm is the pressure of the outlet of the evaporator.