Complex sentence: John Cawte Beaglehole was born in Wellington, New Zealand (13 June 1901-10 October 1971) was a historian based mainly at the Victoria University of Wellington who wrote the definitive biography of James Cook, the explorer, and edited his journals.
Split into simpler sentences: John Cawte Beaglehole (13 June 1901-10 October 1971) was born in Wellington, New Zealand. He was a historian based mainly at the Victoria University of Wellington who wrote the definitive biography of James Cook, the explorer, and edited his journals.