Conversation so far:
When did Lou Holtz start coaching South Carolina?
Holtz came out of retirement in 1999 and returned to the University of South Carolina.
What did he do for the program?
The eight-game improvement from the previous year was the best in the nation in 2000.
How long did he remain their coach?
Holtz finished his six-year tenure at South Carolina with a 2-4 record versus his former team, Arkansas.
Where did he go after South Carolina?
CANNOTANSWER.

Question: Why did he leave South Carolina?
Self-contained rewrite: Why did Lou Holtz leave South Carolina?