The man, who cannot be named, was sentenced in a Sydney court on Thursday afternoon, as his victims and the Oxley detective in charge of the case watched on.

The man will spend at least eight years behind bars for the offending, some of which dates back to 2011. Much of the detail cannot be reported for legal reasons.

The man - who was aged in his late 50s at the time of his arrest in Tamworth in November 2017 - has been in custody since.

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Judge Deborah Payne handed down her sentence in Parramatta District Court and convicted him of two charges of aggravated sexual assault of a victim under the age of 16; two counts of indecent assault of a person under 16 years that is domestic violence-related; and using a child under 14 years of age to make child abuse material.

A string of other charges were taken into account in sentencing including aggravated sexual assault of a victim under the age of 16; committing an act of indecency with a person under 16; and five counts of DV-related indecent assault of a person under 16.

Judge Payne had moved the case from Tamworth in March to Sydney for sentencing, after the defence needed time to gather medical evidence from a treating specialist for a serious illness diagnosed while in custody.

On Wednesday and Thursday, submissions from the Crown and defence as well as victim impact statements were delivered in court before the sentence was handed down.

References from a Tamworth friend and a former partner were also tendered in the defence case.

The offender received a 25 per cent discount for his pleas on two charges, as well as a 15 per cent discount on three charges.

Judge Payne imposed a head sentence of 12 years to date from May 2018, with a non-parole period of eight years. The offender will be first eligible for parole in May 2026.

Strike Force Duncansby arrested the man in Tamworth on November 23, 2017. The strike force was launched by Oxley police to investigate allegations of historical sex abuse.

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