Simplify the following text for a Grade 6 native English-speaking person.
Original: It was selected as a penal settlement because it was geographically isolated from the rest of the colony but more easily reachable by sea than the other place of secondary banishment , Macquarie Harbour on the west coast , which could then be closed down .
Simplified: It was selected as a penal colony because it was isolated from the rest of Tasmania . It could be easily got to by sea .