Complex sentence: The students came from different classes and backgrounds: some were famous communism revolutionaries or scholars, others with little education but much experience in communist movements, the university grouped these students into different classes according to their education and experience.
Split into simpler sentences: The students came from different classes and backgrounds: some were famous communism revolutionaries or scholars, while others had little education but much experience in communist movements. The university grouped these students into different classes according to their education and experience.