Complex sentence: The most powerful ministry was the Ministry of Foreign Affairs and former head of the ministry are such notables as Leon Trotsky, Vyacheslav Molotov and Andrei Gromyko.
Split into simpler sentences: The most powerful ministry was the Ministry of Foreign Affairs. Its former heads were notables such as Leon Trotsky, Vyacheslav Molotov and Andrei Gromyko.