Evaluation of the Efficacy of "Lifespan Integration" (LI) Therapy in Patients With Complex Post-Traumatic Stress Disorder

This study tests the effectiveness of a therapy called Lifespan Integration (LI) for people with complex PTSD (post-traumatic stress disorder caused by repeated or prolonged trauma). LI is a gentle, memory-based therapy that helps the nervous system heal from deep emotional wounds. **You may be eligible if...** - You have been diagnosed with complex PTSD - You speak French - You have never previously received Lifespan Integration therapy - You may be taking psychiatric medications **You may NOT be eligible if...** - You are currently in another type of psychotherapy (a 4-week break from other therapy is required first) - You are currently experiencing a manic or psychotic episode - You have a chronic psychotic disorder - You have been diagnosed with autism spectrum disorder or intellectual disability Talk to your doctor to see if this trial is right for you.