Complex sentence: He played a major role in transforming the South African justice system, and in 1999, following the election of Thabo Mbeki as President, Omar became the Minister of Transport, a post that he held until his death of cancer.
Split into simpler sentences: He played a major role in transforming the South African justice system. In 1999, following the election of Thabo Mbeki as President, Omar became the Minister of Transport, a post that he held until his death of cancer.