Complex sentence: The locomotives were initially placed in service on the Natal South Coast line and, while they later also worked on other branchlines, they spent their entire working lives in Natal, until they were withdrawn from service in 1962.
Split into simpler sentences: The locomotives were initially placed in service on the Natal South Coast line. Although they later also worked on other branch lines, they spent their entire working lives in Natal until they were withdrawn from service in 1962.