Simplify the following text for a Grade 10 native English-speaking person.
Original: Puerto Rico ( Spanish for `` rich port '' ) comprises an archipelago that includes the main island of Puerto Rico and a number of smaller islands , the largest of which are Vieques , Culebra , and Mona .
Simplified: The Commonwealth of Puerto Rico includes the largest , main island and a number of smaller islands , including Mona , Vieques , and Culebra .