Complex sentence: He remarried 25 August 1766, Henrietta Fielding, daughter of novelist Henry Fielding who was already "in deep decline", and died months later, 11 December 1766.
Split into simpler sentences: He remarried 25 August 1766, Henrietta Fielding, daughter of novelist Henry Fielding. She was already "in deep decline", and died months later, 11 December 1766.