Complex sentence: At the time, he was teaching at the Institute for Colored Youth (ICY), which would later become Cheyney University of Pennsylvania, one of the early schools dedicated to educating black youth in the country.
Split into simpler sentences: At the time, he was teaching at the Institute for Colored Youth (ICY). It later became Cheyney University of Pennsylvania, one of the earliest colleges dedicated to educating black youth in the country.