Simplify the following text for a Grade 8 native English-speaking person.
Original: MÃ hlin is a municipality of the district of Rheinfelden in the canton of Aargau in Switzerland .
Simplified: The municipality is located in the Rheinfelden district , along the MÃ hlinbach ( MÃ hlin stream ) . It consists of the two parts ObermÃ hlin ( Upper MÃ hlin ) and UntermÃ hlin ( Lower MÃ hlin ) in the south of the railway line and of Riburg in the north .