Original sentence: The annexation of Hyderabad in September 1948 by "Hyderabad Police Action" (code-named "Operation Polo") was the operation by the Indian armed forces that ended the rule of the Nizam of Hyderabad and led to the integration of the princely state of Hyderabad into the Indian Union
Edited sentence: The liberation of Hyderabad in September 1948 by "Hyderabad Police Action" (code-named "Operation Polo") was the operation by the Indian armed forces that ended the rule of the Nizam of Hyderabad and led to the integration of the princely state of Hyderabad into the Indian Union