Atlanta-based Sharecare Inc.is buying a division of Nashville, Tenn.-based Healthways (Nasdaq: HWAY), the companies announced Wednesday. The sale comes amid a $25 million corporate restructuring to streamline Healthways' business portfolio and focus on the company's profitable Network Solutions segment, which includes the senior fitness group Silver Sneakers and exercise network Prime Fitness. Jeff Arnold, Sharecare's founder, CEO and chairman, said in a statement, "Our relationship with Healthways…