Complex sentence: Yang reasoned that the Chinese masses had long been used to autocratic rule, the Republic had only been effective as a transitional phase to end Manchu rule, and China's political situation demanded the stability that only a monarchy could ensure.
Split into simpler sentences: Yang reasoned that the Chinese masses had long been used to autocratic rule, and that the Republic had only been effective as a transitional phase to end Manchu rule. He reasoned that China's political situation demanded the stability that only a monarchy could ensure.