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その文は2つに分解したときに
Professor Anthony zwi was born in south Africa.
He went to school and university in south Africa.
という2文に分かれますよね。
前半の文のsouth Africaが先行詞です。
で、後半の文のin south Africa.を
in which というふうに名詞だけを関係代名詞に変えるか
もしくはin south Africaという副詞句全体をwhereという関係副詞に変えるかして、
それで語順を動かして一つに繋げたのが
Professor Anthony zwi was born in south Africa, in which he went to school and university.
Professor Anthony zwi was born in south Africa, where he went to school and university.
です。
関係副詞については
Professor Anthony zwi was born in south Africa.
He went to school and university there.
という2文を考えて、thereをwhereに変えて語順を動かして繋いだ、と考えても良いです。(というかそれが正確)