Simplify the following text for a Grade 11 native English-speaking person.
Original: Operation Bluestar ( 3 â `` 6 June 1984 ) was an Indian military operation ordered by Indira Gandhi , then Prime Minister of India to remove armed Sikh separatists from the Golden Temple in Amritsar .
Simplified: The city is also famous for Operation Bluestar , a military operation , that took place in 1984 that was ordered by the late Prime Minister of India , Indira Gandhi .