Complex sentence: Grandi was one of the Fascist Party's top leadership, the "gerarchi"; although he had been a close colleague of Mussolini for over 20 years, he was more a right-wing conservative than a Fascist.
Split into simpler sentences: Grandi was one of the Fascist Party's top leadership, the "gerarchi". Although he had been a close colleague of Mussolini for over 20 years, he was more a right-wing conservative than a Fascist.