Conversation so far:
What happened to Lebron James in 2010?
LeBron James became an unrestricted free agent at 12:01 am EDT on July 1, 2010.
What basketball team was LeBron James leaving?
After failing to win a championship with Cleveland, LeBron James left in 2010.

Question: what did he do as a free agent?
Self-contained rewrite: What did Lebron James do as a free agent in 2010?