Conversation so far:
Where did Ruhollah Khomeini live before returning to Iran?
Ruhollah Khomeini spent more than 14 years in exile, mostly in the holy Iraqi city of Najaf.
What year did Ruhollah Khomeini return to Iran after exile?
On Thursday, 1 February 1979, Ruhollah Khomeini returned in triumph to Iran.
Why did Ruhollah Khomeini decide to return Iran after exile?
Ruhollah Khomeini decided to return to Iran after Mohammad Reza Pahlavi, the Shah of Iran, fled on 16 January 1979.
Why was Ruhollah Khomeini's exile lifted?
Mohammad Reza Shah's monarchy was overthrow by the Iranian Revolution.
Did Ruhollah Khomeini have a warm welcome when he returned to Iran?
Ruhollah Khomeini returned in triumph to Iran, welcomed by a joyous crowd estimated to be of up to five million people.

Question: What did he do once he was back?
Self-contained rewrite: What did Ruhollah Khomeini do once he was back to the country of Iran?