Complex sentence: On the morning of April 28,1871 a group of 94 Tohono O'odham (aka Papago) Indians, 48 Mexicans and 6 Americans left Tucson for Camp Grant, and on April 30,1871 the Tucson group attacked the camps of the Pinal and Aravaipa Apaches.
Split into simpler sentences: On the morning of April 28,1871 a group of 94 Tohono O'odham (aka Papago) Indians, 48 Mexicans and 6 Americans left Tucson for Camp Grant. On April 30,1871 the Tucson group attacked the camps of the Pinal and Aravaipa Apaches.