Complex sentence: The DC-4 serial number 18380 was built in 1934 had been delivered officially as a C-54B Skymaster to the United States Air Force in October 1944, on the same day it was transferred with the designation R5D-2 to the United States Navy.
Split into simpler sentences: The DC-4 serial number 18380 was built in 1934 and was delivered officially as a C-54B Skymaster to the United States Air Force in October 1944. On the same day it was transferred with the designation R5D-2 to the United States Navy.