Simplify the following text for a Grade 5 native English-speaking person.
Original: As the only child of Maximiliaan van Egmond and FranÃ oise de Lannoy , she was suo jure Countess of Buren and Lady of Egmond .
Simplified: She was the only child of Maximiliaan van Egmond and FranÃ oise de Lannoy .