Complex sentence: He was therefore still only a child of seven when, on 7 February 1450, he was married to the six-year-old Lady Margaret Beaufort, though the Papal dispensation to marry was not signed until 18 August 1450.
Split into simpler sentences: He was therefore still only a child of seven when, on 7 February 1450, he was married. This was to the six-year-old Lady Margaret Beaufort, though the Papal dispensation to marry was not signed until 18 August 1450.