Complex sentence: There are ten archaeologically excavated rice paddy fields in Korea, and the two oldest are the Okhyun and Yaumdong sites found in Ulsan, dating to the early Mumun pottery period.
Split into simpler sentences: There are ten archaeologically excavated rice paddy fields in Korea. The two oldest are the Okhyun and Yaumdong sites, found in Ulsan, dating to the early Mumun pottery period.