Simplify the following text for a Grade 7 native English-speaking person.
Original: In the 12th and 13th century , Guelders quickly expanded downstream along the sides of the Maas , Rhine , and IJssel rivers and even claimed the succession in the Duchy of Limburg , until it lost the 1288 Battle of Worringen against Berg and Brabant .
Simplified: In the 12th and 13th century , Guelders became larger very quickly downstream along the sides of the Maas , Rhine , and IJssel rivers . It even claimed the lands in the Duchy of Limburg .