Complex sentence: The Revised Romanization of Korean is the official Korean language romanization system in South Korea, used as a replacement for the 1984 McCune-Reischauer--based romanization system.
Split into simpler sentences: The Revised Romanization of Korean is the official Korean language romanization system in South Korea. It is the official South Korean replacement for the 1984 McCune-Reischauer--based romanization system.