Simplify the following text for a Grade 6 native English-speaking person.
Original: It has an area of around 572 k. Besides the island of Mann itself , the political unit of the Isle of Man includes some nearby small islands : the seasonally inhabited Calf of Man , Chicken Rock on which stands an unmanned lighthouse , St Patrick 's Isle and St Michael 's Isle .
Simplified: Apart from the island itself , the Isle of Man also includes some nearby islands . The most important of these islands are called Calf of Man , St Patrick 's Ilse and St Michael 's Isle .