Complex sentence: By 25 January 1867, the original line, between Market Square in Durban and Point station at Durban harbour, had only been extended by a further to Umgeni, from where stone, quarried from the Umgeni River, was transported to the harbour.
Split into simpler sentences: By 25 January 1867, the original line between Market Square in Durban and Point station at Durban harbour, had only been extended by a further to Umgeni. From there stone, quarried from the Umgeni River, was transported to the harbour.