Simplify the following text for a Grade 10 native English-speaking person.
Original: Magdalena 's father , Johann Heinrich Keverich , had been Chef at the court of the Archbishopric of Trier at Festung Ehrenbreitstein fortress opposite to Koblenz .
Simplified: Johann married Maria Magdalena Keverich in 1767 ; she was the daughter of Johann Heinrich Keverich , who had been the head chef at the court of the Archbishopric of Trier .