Complex sentence: The exception is South Africa who with its strict influx control regime and apartheid policy to a certain degree managed to control the urbanization growth, it is non the less one of the most urbanized countries of Africa and now have a low urbanization growth.
Split into simpler sentences: The exception is South Africa who, with its strict influx control regime and apartheid policy, to a certain degree managed to control urban growth. It is nonetheless one of the most urbanized countries of Africa and now has a low urbanization growth.