Ian Read, Pfizer’s new chief executive officer, has made changes to the company’s executive team. Mr. Read elevated his executive team to take over the responsibilities of his former position, overseeing the sales and marketing of certain prescription drug units. The team includes longtime employees Olivier Brandicourt and David Simmons. Mr. Brandicourt runs Pfizer’s prescription drugs business. Mr. Simmons was instrumental in the company’s expansion into emerging markets, such as China, a...