Complex sentence: Messali Hadj, Imache Amar, Si Djilani, and Belkacem Radjef rapidly built a strong following throughout France and Algeria in the 1930s; they developed militants who became vital to the fighting for an independent Algeria.
Split into simpler sentences: Messali Hadj, Imache Amar, Si Djilani, and Belkacem Radjef rapidly built a strong following throughout France and Algeria in the 1930s. They developed militants who became vital to the fighting for an independent Algeria.