Question: Brian Olsen was the last WEC Champion before it was purchased by which sports promotion company?
Sentence (from "Zuffa"): It was founded in January 2001 in Las Vegas, Nevada, by Station Casinos executives Frank Fertitta III and Lorenzo Fertitta to be the parent entity of the Ultimate Fighting Championship (UFC) after they purchased it from the Semaphore Entertainment Group.
Relevant evidence: No