Complex sentence: For example, if one were to list Cu, Cl -, Na and Cr in order, one would get their reduction potentials, change the sign to make them oxidation potentials, and list them from greatest to least.
Split into simpler sentences: For example, if you list Cu, Cl -, Na and Cr in order, you get their reduction potentials. Change the sign to make them oxidation potentials, and list them from greatest to least.