Simplify the following text for a Grade 8 native English-speaking person.
Original: ( Wertham 's claim that Wonder Woman had a bondage subtext was somewhat better documented , as her creator William Moulton Marston had admitted as much ; however , Wertham also claimed that Wonder Woman 's strength and independence made her a lesbian . )
Simplified: Her creator William Moulton Marston had said the same thing . However , Wertham also claimed that Wonder Woman 's strength and independence made her a lesbian .