Simplify the following text for a Grade 8 native English-speaking person.
Original: While Moondyne Joe was bushranging in 1869 , an Irish political prisoner named John Boyle O'Reilly was serving time in Fremantle Prison .
Simplified: While Moondyne Joe was bushranging in 1869 , an Irish prisoner named John Boyle O'Reilly was in Fremantle Prison .