Simplify the following text for a Grade 8 native English-speaking person.
Original: Located at the junction of the Parramatta and Lane Cove rivers , Cockatoo Island is a former imperial prison , industrial school , reformatory and gaol .
Simplified: It is at the junction of the Parramatta and Lane Cove rivers . Cockatoo Island has been a prison , industrial school , and reformatory ( a prison for boys ) .