Complex sentence: The former favoured the plebeians (the commoners, the majority of the population), wanted to address the problems of the urban poor and promoted reforms which would help them, particularly the redistribution of land for the landless poor to farm and debt relief.
Split into simpler sentences: The former favoured the plebeians (the commoners, the majority of the population). They wanted to address the problems of the urban poor and promoted reforms that would help them, particularly redistribution of land for the landless poor and farm and debt relief.