Complex sentence: Urse was appointed Sheriff of Worcester some time after the Norman Conquest of England, probably in about 1069, part of the wholesale replacement of English royal officials with Norman and other immigrants that took place in the early part of William's reign.
Split into simpler sentences: Urse was appointed Sheriff of Worcester some time after the Norman Conquest of England, probably in about 1069. This was part of the wholesale replacement of English royal officials with Norman and other immigrants that took place in the early part of William's reign.