Original: President Chen Shui-bian (2000-May 2008) fully supported the idea that the "Republic of China is an independent, sovereign country" but held the view that the Republic of China is Taiwan and Taiwan does not belong to the People's Republic of China. This is suggested in his Four-stage Theory of the Republic of China.
Simplified: One is the People's Republic of China (China), the other is the Republic of China (Taiwan).