Complex sentence: This rice mill chimney is significant as one of seven known extant rice mill chimneys in Georgetown County and for its association with Weehaw, on the Black River, which was one of the earliest successful rice plantations in the area.
Split into simpler sentences: This rice mill chimney is significant as one of seven known extant rice mill chimneys in Georgetown County. It is associated with Weehaw, on the Black River, which was one of the earliest successful rice plantations in the area.