Complex sentence: Anne Howard, Countess of Arundel née Dacre (21 March 1557--19 April 1630), was an English noblewoman, who became a Catholic conspirator, having converted to the faith in the early 1580s.
Split into simpler sentences: Anne Howard, née Dacre (21 March 1557--19 April 1630), was the Countess of Arundel. She was a Catholic conspirator, having converted to the faith in the early 1580s.