Complex sentence: Northfield Mount Hermon School, commonly abbreviated to NMH, is a co-educational independent boarding high school for boarding and day students in grades 9--12 located on the banks of the Connecticut River and adjacent to the towns of Northfield and Gill, Massachusetts, United States.
Split into simpler sentences: Northfield Mount Hermon School, commonly referred to as NMH, is a co-educational independent boarding high school for students in grades 9--12. The school is located on the banks of the Connecticut River, adjacent to the towns of Northfield and Gill, Massachusetts, United States.