Complex sentence: Pitts signed with Seattle as a free agent before the start of the 2010 NFL season, but was not able to recover enough from his off-season surgery to play before being released on 1 October 2010, making him an NFL free agent.
Split into simpler sentences: Pitts signed with Seattle as a free agent before the start of the 2010 NFL season, but was never able to recover enough from his off-season surgery to play. On 1 October 2010, the Seahawks released Pitts, making him an NFL free agent.