Complex sentence: However, due to World War II, the 1943 and 1945 national conventions were not held, and so the first National Intercollegiate Band was formed and gave a concert on the evening of Friday, March 7,1947.
Split into simpler sentences: However, due to World War II, the 1943 and 1945 national conventions were not held, and so the next convention was held in 1947. The first National Intercollegiate Band gave a concert on the evening of Friday, March 7,1947.