Complex sentence: He enlisted in the Marines in July 1940 from Baltimore, Maryland, and went to recruit training at Marine Corps Recruit Depot Parris Island followed by training at Marine Corps Base Quantico and New River.
Split into simpler sentences: He enlisted in the Marine Corps in July 1940 from Baltimore, Maryland. He went to recruit training at Marine Corps Recruit Depot Parris Island, followed by training at Marine Corps Base Quantico and New River.