Complex sentence: The M110 155 Projectile is a chemical artillery shell used by the U.S. Army and U.S. Marine Corps, with variants of the original shell are used for marking, signaling, and screening purposes.
Split into simpler sentences: The M110 155 Projectile is a chemical artillery shell used by the U.S. Army and U.S. Marine Corps. Variants of the original shell are used for marking, signaling, and screening purposes.