Complex sentence: Rainn Wilson said that the season made some mistakes "creatively"; for instance, he argued that the chemistry between Spader and Helms was "a bit dark" and that the show should have gone for a "brighter and more energized" relationship.
Split into simpler sentences: Rainn Wilson said that the season possessed some mistakes "creatively", such as the chemistry between Spader and Helms, which he called "a bit dark". He argued that the show should have gone for a "brighter and more energized" relationship.