Complex sentence: In January 1812 Cochrane married Matilda Lockhart-Ross (daughter of Lieutenant General Sir Charles Ross); they had two sons (including Alexander Dundas Ross Cochrane) and two daughters.
Split into simpler sentences: In January 1812, Cochrane married Matilda Lockhart-Ross, daughter of Lieutenant General Sir Charles Ross. They had two sons, including Alexander Dundas Ross Cochrane, and two daughters.