He was an involved family man, taking his family to live in Hawaii for some months and on other travels. They regularly spent summers on board the Delta Queen. The children convinced him to save the Delta Queen in 1958 when they learned that the boat was in financial distress and was not accepting reservations. Due to his children's demands, Simonton bought a controlling interest in the company and made it profitable. He also founded Pacific Network, Inc. (PNI) and California Communications (CCI), firms that rented motion picture sound equipment to studios. In the early 1970s, Simonton had an emergency operation for complications of appendicitis; the operation went wrong and he suffered brain damage as a result. He spent several years struggling to regain full command of basic skills, including control of his speech. At this point, he largely retired from public life, although in time he was able to continue his love of travel and his wide community of friends. He died in 1979 from a heart problem, likely related to the damage sustained in the operation. As a tremendous fan of theatre organ music, Simonton arranged a gathering at his home on February 8, 1955, where he and several other organ enthusiasts founded an association called the American Theatre Organ Enthusiasts, later shortened to the American Theatre Organ Society, which is still highly active today. During the remainder of his life, he was extremely active in the preservation and promotion of theatre organs and the music played upon them. His home contained two organs, a church-style Aeolian-Skinner pipe organ upstairs which was dedicated by Virgil Fox and a Wurlitzer theatre organ downstairs in the theatre, which was equipped with professional recording equipment. Film showings at his home were often accompanied by live organ, played by some of the great theatre organists of the day, including Gaylord Carter, Jesse Crawford, Gordon Kibbee and Korla Pandit, all of whom performed and recorded at the house. Simonton also owned a third organ, the Wurlitzer pipe organ from the New York Paramount Theatre, which has been considered the greatest Wurlitzer pipe organ ever built. It had been the favored instrument of Jesse Crawford. Simonton acquired it with the idea of buying the Belmont Theatre in Los Angeles and installing the organ, but the deal for the theatre fell through and the organ was never set up in Los Angeles. It is now in the civic center in Wichita, Kansas. For a time Simonton also owned the Rogers touring organ. This was one of the touring organs used by Virgil Fox.