Complex sentence: The 124th Field Artillery Armory was leased from the state of Illinois to provide more space in March 1944 and about of space was leased or built, at a cost of $2 million.
Split into simpler sentences: The 124th Field Artillery Armory was leased from the state of Illinois to provide yet more space in March 1944. In all, some of space was leased or built, at a cost of $2 million.