Complex sentence: In 1943, Shimer president Albin C. Bro invited the Department of Education at the University of Chicago to evaluate the college community; its 77 recommendations became the basis for Shimer's transformation from a conservative finishing school to a nontraditional, co-educational four-year college.
Split into simpler sentences: In 1943, Shimer president Albin C. Bro invited the Department of Education at the U. of C. to evaluate the entire college community. The 77 recommendations they returned would become the basis for Shimer's transformation from a conservative finishing school to a nontraditional, co-educational four-year college.