Simplify the following text for a Grade 8 native English-speaking person.
Original: The Admiralty was the name of the ministry which controlled the British Royal Navy . In 1963 the independent War Office , Admiralty and Air Ministry were joined to create the Ministry of Defense which controls all of the British Armed Forces .
Simplified: In 1964 the Admiralty was subsumed into the Ministry of Defense along with the War Office and the Air Ministry .