Complex sentence: Mongiello attended Saint Philomena Elementary School, Monsignor Bonner High School and then enlisted into the United States Navy at the age of 18, graduating from Basic Enlisted Submarine School in 1984 and reported to his first of six nuclear submarines, USS Sunfish.
Split into simpler sentences: Mongiello attended Saint Philomena Elementary School, Monsignor Bonner High School and then enlisted into the United States Navy at the age of 18. He then graduated Basic Enlisted Submarine School in 1984 and reported to his first of six nuclear submarines, USS Sunfish.