PARIS — The founder of a French charity who helped improve the lives of people with learning disabilities for over half a century had also engaged in “manipulative sexual relationships” with at least six women, the charity has revealed in a new internal report.

The report, released last week by the French-based charity, L’Arche International, said that Jean Vanier, the charity’s founder, had relationships with women from 1970 to 2005 that were at turns “inappropriate,” “coercive” or “non-consensual.” It also said he had a “psychological hold” over some of the victims.