Simplify the following text for a Grade 9 native English-speaking person.
Original: Twelve years later , in the Treaty of Aix-la-Chapelle ( 1748 ) , Austria lost the Duchy , and Philip became the new Duke , founding the House of Bourbon-Parma .
Simplified: Twelve years later , in the Treaty of Aix-la-Chapelle ( 1748 ) , Austria lost Parma , and Philip became the new Duke , founding the Bourbons of Parma .