Complex sentence: In 1952 the U.S. Navy turned its PT boats over to the South Korean Navy; these boats flew under a Korean flag and were manned by US Sailors under the command of Bucklew.
Split into simpler sentences: In 1952 the U.S. Navy turned its PT boats over to the South Korean Navy. These boats flew under a Korean flag but were manned by American sailors under the command of Bucklew.