Complex sentence: The Graduate School of Arts and Sciences (GSAS) is one of twelve graduate schools of Harvard University, responsible for the majority of post-baccalaureate degree programs offered through the Harvard Faculty of Arts and Sciences.
Split into simpler sentences: The Graduate School of Arts and Sciences (GSAS) is one of twelve graduate schools of Harvard University. It is responsible for the majority of Harvard's post-baccalaureate degree programs through the Harvard Faculty of Arts and Sciences.