Complex sentence: Emmet Crawford (December 22,1844--January 18,1886) was an American soldier who rose through the ranks to become officer and was most noted for his time spent in Arizona under General George Crook in the United States Cavalry.
Split into simpler sentences: Emmet Crawford (December 22,1844--January 18,1886) was an American soldier who rose through the ranks to become an officer. He was most noted for his time spent in the Arizona Territory under General George Crook in the United States Cavalry.