Complex sentence: Brinker continued working for the company in this capacity until 1982 when he was promoted to president of Pillsbury's food service division, which included the company's other chains beyond Burger King.
Split into simpler sentences: Brinker continued working for the company in this capacity until 1982 when he was promoted to president of Pillsbury's food service division. His new role expanded his oversight to include the company's other chains beyond Burger King.