One example are the San of the Kalahari Desert, who 2) . (live) in parts of southern Africa since around 25,000 BC. Typically, nomads 3) ... (lead) a simple life.
Here is the corrected text: "One example is the San of the Kalahari Desert, who live in parts of southern Africa since around 25,000 BC. Typically, nomads lead a simple life."