Complex sentence: The son of Colonel Henry George Montfort Dunn and Catherine Mary (née Kinloch), John Dunn was educated at Winchester College and Millfield and studied history at King's College, Cambridge.
Split into simpler sentences: The son of Colonel Henry George Montfort Dunn and Catherine Mary (née Kinloch), John Dunn was educated at Winchester and Millfield. He studied history at King's College, Cambridge.