Simplify the following text for a Grade 9 native English-speaking person.
Original: The Salland tourism board describes Salland as the land in between the river IJssel and the hills , and agrees thus on a much smaller Salland than the historical dominion of that name .
Simplified: The history of Salland goes back to the early Middle Ages , when the four quarters of Oversticht ( Salland , Twente , Land van Vollenhove and Drenthe ) came together . Salland ( and nearby areas ) may have been the early seat of the Salian Franks , the founders of the modern Dutch and French nations .