Original: The result was often a merger of the two into a "district" (e.g. Rotorua) or a change of name to "district '(e.g. Waimairi) or" city "(e.g. Manukau City).
Simplified: Because of this, sometimes they put the two together, making a "district" (e.g. Rotorua). Or sometimes they changed the name to "district" (e.g. Waimairi) or "city" (e.g. Manukau).