A Perth man who raped two teenagers more than 30 years ago, but was only charged last July after a genetic genealogy breakthrough linked him to the crimes, has been jailed for 13 and a half years.

Kevin Frederick Combes, 56, had pleaded guilty to six charges including the aggravated sexual assaults of a 19-year-old woman in Perth in 1990 and a 17-year-old girl in South Boulder in 1991.

Combes was sentenced in the WA District Court, where Judge Wendy Hughes handed him a total sentence of 13 and a half years.

He will be made eligible for parole.

A family member of one of the victims — whose identity is suppressed — expressed gratitude for the efforts of police and their "unwavering pursuit" of the cold case.

"Their dedication, persistence and commitment have finally brought this dangero

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