JOHANNESBURG — A charity affiliated with Oprah Winfrey has contributed at least $725,000 toward renovating a school in South Africa, where the group already has helped fund a primary school and Winfrey has built a lavish $40 million academy for girls.The refurbished Vele High School in South Africa's Limpopo province will feature 16 classrooms and accommodate some 640 students when it is officially complete in January, Gregg Sherkin, program officer for Oprah's Angel Network, said Thursday.Read More... More on Oprah