Complex sentence: During the 2006 off-season Kluwe had arthroscopic surgery on his right knee to replace the ACL and the operation was successful and Kluwe returned to the Vikings in full health for the 2006 season.
Split into simpler sentences: During the 2006 off-season Kluwe had arthroscopic surgery on his right knee to repair the ACL. The operation was successful and Kluwe returned to the Vikings in full health for the 2006 season.