Complex sentence: They moved back to the south of England for the sake of Catherine's health, and settled at Bury St Edmunds from 1806 to 1816, after which they lived at Playford Hall, halfway between Ipswich and Woodbridge, Suffolk.
Split into simpler sentences: They moved back to the south of England for the sake of Catherine's health, and settled at Bury St Edmunds from 1806 to 1816. Next they lived at Playford Hall, located halfway between Ipswich and Woodbridge, Suffolk.