Simplify the following text for a Grade 6 native English-speaking person.
Original: While Johns was serving his sentence , there were a rash of convict escapes and attempted escapes , but Johns remained well behaved . His good behavior earned him a remission on his sentence , and he was released on a ticket of leave in February 1864 .
Simplified: Johns was a well behaved prisoner , so he was let out early with a ticket of leave in February 1864 .