Complex sentence: The ABIM Foundation is a not-for-profit foundation established by the American Board of Internal Medicine (ABIM) in 1999 by the American Board of Internal Medicine (ABIM) to advance medical professionalism and physician leadership in quality assessment and improvement.
Split into simpler sentences: The ABIM Foundation is a not-for-profit foundation established by the American Board of Internal Medicine (ABIM). The Foundation advances medical professionalism and physician leadership in quality assessment and improvement.