Complex sentence: McQueen was introduced to the Harvard Humanitarian Initiative (HHI) after completing her MPH at the Harvard School of Public Health in 2002 and became a fellow for HHI and went on to conduct of her work on anesthesia and surgical infrastructure.
Split into simpler sentences: McQueen was introduced to the Harvard Humanitarian Initiative (HHI) after completing her MPH at the Harvard School of Public Health in 2002. She later became a fellow for HHI and went on to conduct of her work on anesthesia and surgical infrastructure.