Complex sentence: During World War II, Mercer was one of 131 colleges and universities in the V-12 Navy College Training Program, which offered military training that prepared students for a commission in the United States Navy.
Split into simpler sentences: During World War II, Mercer was one of 131 colleges and universities that participated in the V-12 Navy College Training Program. The program offered military training that prepared students for a commission in the United States Navy.