Complex sentence: His father was an alderman of the town and had an estate at Leixlip in County Kildare; his grandfather, the elder Richard Jebb, had come to Ireland from Mansfield in Nottinghamshire.
Split into simpler sentences: His father was an alderman of the town and had an estate at Leixlip in County Kildare. His grandfather, also Richard Jebb, had come to Ireland from Mansfield in Nottinghamshire.