Complex sentence: He is president and chief executive officer at the CareMore Health System after serving as Chief Medical Information and Innovation Officer at Merck and Co, lecturer in health care policy at Harvard Medical School, and attending physician at the Boston VA Hospital.
Split into simpler sentences: He is president and chief executive officer at the CareMore Health System. He served previously as Chief Medical Information and Innovation Officer at Merck and Co, lecturer in health care policy at Harvard Medical School, and attending physician at the Boston VA Hospital.