Complex sentence: Their son was Thomas Manners, 1st Earl of Rutland, and their daughter, Lady Eleanor Manners (1505--16 September 1548) married John Bourchier, 2nd Earl of Bath, and had descendants.
Split into simpler sentences: Their son was Thomas Manners, 1st Earl of Rutland. And their daughter, Lady Eleanor Manners (1505--16 September 1548) married John Bourchier, 2nd Earl of Bath, and had descendants.