Complex sentence: It was during his OregonLive years that Hollinger developed his Player Efficiency Rating (PER), a figure that attempts to combine all of a player's contributions into one number but it lacks any consideration of shot defense and has been criticized for overvaluing shot-taking.
Split into simpler sentences: It was during his OregonLive years that Hollinger developed his Player Efficiency Rating (PER), a figure that attempts to combine all of a player's contributions into one number. PER has been criticized for lacking any consideration of shot defense and for overvaluing shot-taking.