Original sentence: Therese married Duke Peter of Oldenburg, second and youngest son of Duke George of Oldenburg and his wife Catherine Pavlovna of Russia, on 23 April 1837 in Biebrich
Edited sentence: Therese married Duke Peter of Oldenburg, second and younger son of Duke George of Oldenburg and his wife Catherine Pavlovna of Russia, on 23 April 1837 in Biebrich