Complex sentence: On 16 July 1912, he married Mary Gilmour, daughter of Brigadier-General Sir Robert Gilmour, 1st Baronet and had by her three children, one son and two daughters.
Split into simpler sentences: On 16 July 1912, he married Mary Gilmour, daughter of Brigadier-General Robert Gilmour. They had three children, one son and two daughters.