Simplify the following text for a Grade 8 native English-speaking person.
Original: The Vogelsberg Mountains are a group duct of ancient volcanic activity and are separated from the RhÃ n Mountains by the Fulda River and its valley .
Simplified: The Vogelsberg Mountains are a group of low mountains in central Germany , located in the middle of the state of Hessen . They are the product of ancient volcanic activity and are separated from the RhÃ n Mountains by the Fulda River and its valley .