Complex sentence: He travelled abroad, and on his return in 1634 went to court, next year marrying Katherine Manners, widow George Villiers, 1st Duke of Buckingham, and living on her fortune for some years in great splendour.
Split into simpler sentences: He travelled abroad, and on his return in 1634 went to court. In the following year he married Katherine Manners, widow of George Villiers, 1st Duke of Buckingham, and lived on her fortune for some years in great splendour.