Complex sentence: The program's target was to treat every single one of Botswana's citizens infectd with HIV/AIDS; in addition, ARVs would be given out to those who were at an advanced stage of the disease.
Split into simpler sentences: The program's target was to treat every citizen of Botswana infected with HIV/AIDS. In addition, anti-retrovirals (ARVs) would be given out to those who were at an advanced stage of the disease.