Complex sentence: After the nationalisation of the IPC, Iraq's oil revenue increased from 219 million ID in 1972 to 1.7 billion ID in 1974,3.7 billion ID in 1978 and 8.9 billion ID in 1980: by over 40 times in less than a decade.
Split into simpler sentences: After the nationalisation of the IPC, Iraq's oil revenue increased from, in 219 million ID in 1972 1.7 billion ID in 1974, to 3.7 billion ID in 1978 to 8.9 billion ID in 1980. In short, Iraq increased its oil revenue by over 40 times in less than a decade.