Original: McCune–Reischauer romanization is one of the two most widely used Korean language romanization systems, along with the Revised Romanization of Korean, which replaced (a modified) McCune–Reischauer as the official romanization system in South Korea in 2000.
Simplified: McCune-Reischauer romanization is one of the two most widely used Korean language romanization systems, along with the Revised Romanization of Korean, which replaced (a modified) McCune-Reischauer as the official romanization system in South Korea in 2000.