Complex sentence: Upon completion of shakedown, "Manta" departed New London, Conn., 27 March 1945 for Hawaii via the Panama Canal and sailed from Pearl Harbor 28 May 1945 for her first war patrol, off the Kurile Islands.
Split into simpler sentences: Upon completion of her shakedown cruise, "Manta" departed New London, Connecticut, 27 March 1945 for Hawaii via the Panama Canal. She sailed from Pearl Harbor 28 May 1945 for her first war patrol, off the Kurile Islands.