Simplify the following text for a Grade 10 native English-speaking person.
Original: The largest mangrove forest in the World the Sundarban is spread over the three districts of the division : Satkhira , Khulna and Bagherhat .
Simplified: The largest mangrove forest in the World the Sundarban is spread over the three districts of Satkhira , Khulna and Bagherhat .