Simplify the following text for a Grade 7 native English-speaking person.
Original: The Bali Nine is the name given to a group of nine Australians arrested on 17 April 2005 , in Denpasar , Bali , Indonesia , in a plan to smuggle 8.3 k of heroin valued at approximately A$ 4 million from Indonesia to Australia .
Simplified: The Bali Nine is the name given to nine Australian citizens arrested on April 17 , 2005 , in Denpasar on the island of Bali , Indonesia . They had tried to smuggle 8.3 kg of heroin valued at about AUD 4 million from Indonesia to Australia .