Question: The Broncos are owned by the trust of Pat Bowlen, who served as the Broncos CEO from his purchase of the club during what years?
Sentence (from "Pat Bowlen"): He served as the Broncos CEO from his purchase of the club in 1984 until July 2014, when he stepped down as Broncos' CEO due to the onset and progression of Alzheimer's disease.
Relevant evidence: Yes