Complex sentence: He was succeeded by his elder son, Æneas Simon Mackay, Master of Reay (born 20 March 1965), a banker, who married, on 14 January 2010, Mia Ruulio, elder daughter of Markus Ruulio of Helsinki.
Split into simpler sentences: He was succeeded by his elder son Æneas Simon Mackay, Master of Reay (born 20 March 1965), a banker. He married 14 Jan 2010 Mia Ruulio, elder daughter of Markus Ruulio of Helsinki.