Man who raped and sexually abused daughter so badly she developed multiple personalities, jailed for 45 years

A 74-year-old man who raped and sexually abused his daughter in Sydney so horrendously she developed thousands of identities to cope with her father's actions will die in jail.

Richard Haynes was extradited from the United Kingdom in February 2017 to face dozens of charges of rape, buggery and indecent assault against his daughter, Jeni, in the 1970s and 1980s.

She was aged between four and 11 at the time and was later diagnosed with dissociative identity disorder, previously known as multiple personality disorder.

He pleaded guilty to 25 offences in March.

He has been sentenced to 45 years in jail by Judge Sarah Huggett today in the Downing Centre District Court.

Haynes' barrister Nancy Mikhaiel told court in July his client has several serious health issues, has spent large periods of time in prison isolation by his own request and could die in jail.

Ms Mikhaiel conceded her client's crimes were at the very upper end of seriousness and he would likely be given a life sentence.

After her father was sentenced, Jennifer, said she "can live with 45 years of him in a jail". 

"I don't have to think about him ever again," she said.

"What worried me was he would get a short non-parole period and I would have to go back to court and do it all over again.

"I cannot speak highly enough of the judge because she has recognised in her sentence that I need this to end. I need my life to be about me."

At Haynes' sentencing hearing in May, Jeni said she had waited decades to "smack" her father in the mouth over his abuse.

She looked across at her father - who smirked and stared down in the dock for the hearing - and declared: "Scum."

"He heard me beg him to stop, he heard me cry, he saw the pain, the terror he was inflicting upon me," she said, reading from her victim impact statement.

"He saw the blood and the physical damage he caused and the next day he chose to do it all over again."

Her father's sexual abuse forced her to develop the thousands of personalities as the only way to cope, including "Muscles" and four-year-old "Symphony", two of the 33 identities she embodied while giving evidence.

Ms Haynes has a permanent colostomy bag - which she described as a "degrading, daily reminder" of her father's crimes - and permanent issues with eyesight, hearing, dentistry and mental health.

She feared birthdays, relationships, men, bathrooms and even enjoying food.

Media required Jeni's permission to report both Haynes' name and the nature of his crimes as doing so would identify her as a child victim of crime.

• With AAP