Complex sentence: Contrary to the belief that over 600,000 Chinese troops entered North Vietnam, the actual number was only 200,000, while 600,000 Chinese troops were mobilized, of which 400,000 were deployed away from their original bases during the one month conflict.
Split into simpler sentences: Contrary to the belief that over 600,000 Chinese troops entered North Vietnam, the actual number was only 200,000. However, 600,000 Chinese troops were mobilized, of which 400,000 were deployed away from their original bases during the one month conflict.