Complex sentence: Apart from one brief visit in 1891, Bell did not return to New Zealand until 1896, when he retired to a farm in Otago, he died on his Shag Valley homestead in 1898.
Split into simpler sentences: Apart from one brief visit in 1891, Bell did not return to New Zealand until 1896, when he retired to a farm in Otago. He died on his Shag Valley homestead in 1898.