Complex sentence: South Africa as a whole has more HIV-positive citizens than any other nation, and among South Africa's provinces, KwaZulu-Natal has the highest rate of HIV infection--39 percent, according to UNAIDS in 2009.
Split into simpler sentences: South Africa as a whole has more HIV-positive citizens than any other nation. Among South Africa's provinces, KwaZulu-Natal has the highest rate of HIV infection: 39 percent, according to UNAIDS in 2009.