Complex sentence: In 1942 the New York Legislature elevated it from a normal school to a degree-granting teachers' college, New York State Teachers College at Oswego, which was a founding member of the State University of New York system in 1948.
Split into simpler sentences: In 1942 the New York Legislature elevated it from a normal school to a degree-granting teachers' college, New York State Teachers College at Oswego. It was a founding member of the State University of New York system in 1948.