Complex sentence: East Pakistan had been devastated by the 1970 Bhola cyclone, and the population had been embittered by the slow response of the central government and the political conflict between Pakistan's two major parties, Sheikh Mujibur Rahman's Awami League, and Zulfiqar Ali Bhutto's PPP.
Split into simpler sentences: East Pakistan had been devastated by the 1970 Bhola cyclone, and the population had been embittered by the slow response of the central government. The political conflict between Pakistan's two major parties, Sheikh Mujibur Rahman's Awami League, and Zulfiqar Ali Bhutto's PPP.