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 Nightengale Hall, one of several productive plantations on the Pee Dee River.
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 Nightengale Hall, one of several productive plantations on the Pee Dee River.