Complex sentence: Shortly after the death of her father, on 27 December 1604, Susan married Philip Herbert, Knight of the Garter (1584--1649) an English courtier and politician active during the reigns of James I and Charles I, son of Mary Sidney.
Split into simpler sentences: Shortly after the death of her father, on 27 December 1604, Susan married Philip Herbert, Knight of the Garter (1584--1649). Herbert was an English courtier and politician active during the reigns of James I and Charles I; he was the son of Mary Sidney.