Original: However, when Khomeini began to urge the Shi'ites there to overthrow Saddam and under pressure from the Shah, who had agreed to a rapprochement between Iraq and Iran in 1975, Saddam agreed to expel Khomeini in 1978 to France.
Simplified: Under pressure from the Shah, who had agreed to a rapprochement between Iraq and Iran in 1975, Saddam agreed to expel Khomeini in 1978.