Simplify the following text for a Grade 10 native English-speaking person.
Original: Until 2006 the club was known as LR Ahlen for its major sponsor , but underwent a name change when the sponsor withdrew its support after the team was relegated to the Regionalliga ( III ) in that year .
Simplified: Bundesliga the club was renamed from LR Ahlen into Rot Weiss Ahlen , because of retirement of the main sponsor LR International .