Complex sentence: The 1972 and 1974 strikes were both over pay and both saw success for the NUM. The Miner's strike of 1984-5 ended in victory for the government and is still bitterly resented in some parts of Britain.
Split into simpler sentences: The 1972 and 1974 strikes were both over pay and both saw success for the National Union of Mineworkers. The UK miners' strike of 1984--1985 ended in victory for the government and is still bitterly resented in some parts of Britain.