Complex sentence: During the Korean War, it took part in Operation Chromite, the landings at Inchon where it had the 1st Marine Division, the 7th Infantry Division and other US Army units under its command.
Split into simpler sentences: During the Korean War, it took part in Operation Chromite, the landings at Inchon. At Inchon it had the 1st Marine Division the 7th Infantry Division and other US Army units under its command.