Simplify the following text for a Grade 9 native English-speaking person.
Original: Their surname was Clapp , which has given rise to the widespread but erroneous belief that Clapton 's real surname is Clapp ( Reginald Cecil Clapton is the name of Rose 's first husband , Eric Clapton 's maternal grandfather ) .
Simplified: She left Clapton with his grandparents Jack and Rose Clapp ( Clapton by her first marriage ) and moved to Germany where she married another Canadian soldier .