領導調查的Det Con Amy Green說。"約翰-福賽斯顯然對幼兒構成了重大危險，我們歡迎法庭作出的嚴厲判決。
The abuse came to light when the two victims separately got in touch with police in 2020.
At Leeds Crown Court on Thursday, he was sentenced to 21 years in jail, with a further five on extended licence.
He was convicted of two offences of raping a child under 13, two offences of sexual activity with a child under 13, attempted rape and sexual assault.
Det Con Amy Green, who led the investigation, said: "John Forsyth clearly poses a significant danger to young children and we welcome the strong sentence handed down by the court.
"The appalling offences he committed against his then young victims have affected them both deeply throughout their lives and starkly illustrates the dreadful impact this awful offending has."
She praised both of Forsyth's victims and said it had taken a "lot of courage to disclose such horrific abuse".
She added: "At times it was uncomfortable for them, particularly given a lengthy court process affected by Covid, and they both just wanted justice and closure. We have that now."
Forsyth was told he would not be eligible for parole until he had served two thirds of his sentence.
The BBC is not responsible for the content of external sites.