Complex sentence: He won a scholarship to attend the University of Notre Dame and completed his LLM there in 1990, working for six months thereafter in the Washington, D.C. office of Amnesty International, where he briefly met Nelson Mandela after his release from prison.
Split into simpler sentences: He won a scholarship to attend the University of Notre Dame and completed his LLM there in 1990. For the next six months he worked in the Washington, D.C. office of Amnesty International, where he briefly met Nelson Mandela after his release from prison.