Complex sentence: After World War II, the American forces occupied the facilities, and the Reichsadler and the swastika were removed from the main building's façade, that became block No.7 of the US-McGraw Kaserne.
Split into simpler sentences: After World War II, the American forces occupied the complex, and the Reichsadler and the swastika were removed from the main building's façade. The main building became block no.7 of the US-McGraw Kaserne.