Complex sentence: The Derwent River was one of Australia's finest deepwater ports and was the centre of the Southern Ocean whaling and the sealing trade, the settlement rapidly grew into a major port, with allied industries such as shipbuilding.
Split into simpler sentences: The Derwent River was one of Australia's finest deepwater ports and was the centre of the Southern Ocean whaling and the sealing trade. The settlement rapidly grew into a major port, with allied industries such as shipbuilding.