Conversation so far:
When did Miriam Makeba return to Africa?
Nelson Mandela persuaded Miriam Makeba to return to South Africa, which she did on 10 June 1990.
Who persuaded Miriam Makeba to return to South Africa?
Nelson Mandela was released in February 1990. He persuaded Miriam Makeba to return to South Africa.

Question: What did Makeba do upon her return to South Africa?
Self-contained rewrite: What did Miriam Makeba do upon her return to South Africa?