Simplify the following text for a Grade 6 native English-speaking person.
Original: In 1985 San Fermin day ( July 7 ) he escaped from prison with IÃ aki Pikabea as there was a concert in the jail with Basque singer Imanol Larzabal , they hid themselves inside a loudspeaker .
Simplified: In 1985 he escaped from prison with IÃ aki Pikaea during a concert in the jail with Basque singer Imanol Larzabal . They hid themselves inside a loudspeaker .