Simplify the following text for a Grade 3 native English-speaking person.
Original: DÃ 1\/4 ren is a town in North Rhine-Westphalia , capital of DÃ 1\/4 ren district . It is located between Aachen and Cologne on the river Rur .
Simplified: DÃ 1\/4 ren is located at the river Rur .