Complex sentence: Rear Admiral Frederick Lois Riefkohl (February 27,1889--September, 1969), a native of Maunabo, Puerto Rico was an officer in the United States Navy and the first Puerto Rican to graduate from the United States Naval Academy.
Split into simpler sentences: Rear Admiral Frederick Lois Riefkohl (February 27,1889--September, 1969), a native of Maunabo, Puerto Rico was an officer in the United States Navy. He was the first Puerto Rican to graduate from the United States Naval Academy.