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.

Question: Why did he decide to return?
Self-contained rewrite: Why did Ruhollah Khomeini decide to return Iran after exile?