Conversation so far:
When did Ruhollah Khomeini return to Iran from exile?
On Thursday, 1 February 1979, Ruhollah Khomeini returned to Iran.
What happen to Ruhollah Khomeini after returning to Iran?
Ruhollah Khomeini was welcomed by a joyous crowd estimated to be of up to five million people.

Question: Did he do anything else important?
Self-contained rewrite: Did Ruhollah Khomeini do anything else important after returning to Iran?