Complex sentence: The Supreme Council for National Reconstruction, initially named the Revolutionary Committee, was a military junta that oversaw the government of South Korea from May 16,1961 until the inauguration of the Third Republic of South Korea in 1963.
Split into simpler sentences: The Supreme Council for National Reconstruction, initially named the Revolutionary Committee, was a group of Korean officials. It oversaw the government of South Korea from May 16,1961 until the inauguration of the Third Republic of South Korea in 1963.