Complex sentence: The purpose of the Sovereignty Council was to authenticate the legislation issued by the government since the Council wasn't capable of exercising any powers of objection towards the government's legislation, as the real power lied in the hands of Prime Minister Abd al-Karim Qasim.
Split into simpler sentences: The purpose of the Sovereignty Council was to authenticate the legislation issued by the government. The Council was incapable of exercising objection to government legislation, as the real power lay in the hands of Prime Minister Abd al-Karim Qasim.