Complex sentence: Roundstone is the name of a farm, pub and several local businesses below Highdown Hill, Sussex, England, resulting as local legend would have it from a runaway millstone from the mill on the hill.
Split into simpler sentences: Roundstone is the name associated with a farm, pub and several local businesses below Highdown Hill, Sussex, England. Based on local legend, the name derives from a runaway millstone from the mill on the hill.