Complex sentence: This is later proven to not be the case when he returns to the office in the season 9's "Moving On", where he is shown to be just as, if not even more obsessed with Erin.
Split into simpler sentences: This is later proven not to be the case when he returns to the office in the season 9's "Moving On". He is shown to be just as, if not even more obsessed with Erin.