Simplify the following text for a Grade 7 native English-speaking person.
Original: The Bailiwick of Guernsey is a British Crown Dependency in the English Channel off the coast of Normandy .
Simplified: Guernsey is an island in the English Channel off the coast of Normandy . It is one of the Channel Islands , and is the main administration island of the Bailiwick of Guernsey ' .