Simplify the following text for a Grade 13 native English-speaking person.
Original: Another version of events focuses on Freud 's proposing that unconscious memories of infantile sexual abuse were at the root of the psychoneuroses in letters to Wilhelm Fliess in October 1895 , before he reported that he had actually discovered such abuse among his patients .
Simplified: Freud famously proposed that unconscious memories of infantile sexual abuse were at the root of the psychoneuroses .