Complex sentence: The ratio was set immediately after the controls of the duopoly were transferred from the Ministry of Railways to State-owned Assets Supervision and Administration Commission (SASAC), both were entities of the State Council of the People's Republic of China.
Split into simpler sentences: The ratio was set immediately after the controls of the duopoly were transferred from the Ministry of Railways to State-owned Assets Supervision and Administration Commission (SASAC). Both SASAC and the ministry were entities of the State Council of the People's Republic of China.