Complex sentence: But that would be a mistake, because Little Crow had two additional sites that were used regularly: one at the location of the current Lincoln Center on Ninth Ave and the other camp was near the current day high school football arena.
Split into simpler sentences: But that would be a mistake because Little Crow had two additional sites that were used regularly. One at the location of the current Lincoln Center on Ninth Ave and the other camp was near the current day high school football arena.