The most complicated and persistent of the dissociative disorders is dissociative:

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Dissociative identity disorder (DID), also known as multiple personality disorder, is the most complex and enduring of the dissociative disorders. DID involves the presence of two or more distinct identities or personality states that take control of the individual's behavior. The condition is usually associated with severe childhood trauma or abuse. Dissociative amnesia and fugue are also dissociative disorders, but they are generally less severe and do not involve the presence of multiple personalities. Psychosis is a separate category of mental illness that involves a loss of contact with reality, often accompanied by delusions and hallucinations.

The Most Complicated and Persistent of the Dissociative Disorders Is