Simplify the following text for a Grade 4 native English-speaking person.
Original: Hallstadt is a town in the Upper Franconian district of Bamberg on the left bank of the Main , 4 km north of Bamberg .
Simplified: Hallstadt is a town in the Upper Franconian district of Bamberg . It is on the left bank of the river Main , 4 km north of Bamberg .