Complex sentence: Born on 19 December 1895, the son of Dr J.M. Key, he was educated at Dulwich College in London and commissioned onto the Unattached List for the Indian army on 1 October 1914.
Split into simpler sentences: Born on 19 December 1895, he was the son of Dr J.M. Key. Key was educated at Dulwich College in London and commissioned onto the Unattached List for the Indian army on 1 October 1914.