Original sentence: The 39 captives were retrieved, but the operation cost the lives of 41 U.The United States bombarded military and fuel installations on the Cambodian mainland while a battalion of Marines landed by helicopter on an offshore island to rescue the crew
Edited sentence: The 39 captives were retrieved, but the attack cost the lives of 41 U.The United States bombarded military and fuel installations on the Cambodian mainland and launched an amphibious invasion of an offshore island to rescue the crew