Complex sentence: This branch of the Cholmondeley family descends from Thomas Cholmondeley (d.1653), younger brother of Robert Cholmondeley, 1st Earl of Leinster and Hugh Cholmondeley (1591-1665), ancestor of the Marquesses of Cholmondeley.
Split into simpler sentences: This branch of the Cholmondeley family descends from Thomas Cholmondeley (d.1653). He was the younger brother of Robert Cholmondeley, 1st Earl of Leinster and Hugh Cholmondeley (1591-1665), ancestor of the Marquesses of Cholmondeley.