Complex sentence: With the onset of the Japanese invasion of China, little effort was given to reestablish Chinese control over Outer Mongolia and in 1949, the Communists won the Chinese Civil War and recognized Mongolian independence.
Split into simpler sentences: With the onset of the Japanese invasion of China, little effort was given to reestablish Chinese control over Outer Mongolia. In 1949, the Communists won the Chinese Civil War and recognized Mongolian independence.