Simplify the following text for a Grade 6 native English-speaking person.
Original: Weilburg is , with just under 14,000 inhabitants , the third biggest town in Limburg-Weilburg district in Hesse , Germany , after Limburg an der Lahn and Bad Camberg .
Simplified: Weilburg an der Lahn ( Weilburg on the Lahn river ) is a German town in the Kreis Limburg-Weilburg in the west of Hesse .