Simplify the following text for a Grade 11 native English-speaking person.
Original: he invaded with his troops Saxe-Lauenburg , inhibiting the ascension of the legal female heir Duchess Anna Maria Franziska of Saxe-Lauenburg .
Simplified: he invaded with his troops Saxe-Lauenburg , stopping the legal female heir , Duchess Anna Maria Franziska of Saxe-Lauenburg .