Simplify the following text for a Grade 13 native English-speaking person.
Original: After the war , then allied-occupied Austria was recognized and treated as a separate country , but was not restored to sovereignty until the Austrian State Treaty and Austrian Declaration of Neutrality , both of 1955 , largely due to the rapid development of the Cold War and disputes between the Soviet Union and its former allies over its foreign policy .
Simplified: After the war , then Allied-occupied Austria was recognized and treated as a separate country . It was not restored to sovereignty until the Austrian State Treaty and Austrian Declaration of Neutrality , both of 1955 , largely due to the rapid development of the Cold War and disputes between the Soviet Union and its former allies over foreign policy .