Complex sentence: Hilton College and Michaelhouse have much in common in that they are the only two full boarding schools left in South Africa and are both located near one another in the KwaZulu-Natal Midlands.
Split into simpler sentences: Hilton College and Michaelhouse have much in common in that they are the only two full boarding schools left in South Africa. The schools are located near one another in the KwaZulu-Natal Midlands.