Tyane kidnapped the girls and took them to his shack, where he tied up their arms, put cloths into their mouths and raped them.
Later, he untied the six-year-old and took her to a stadium, where he stabbed her multiple times and left her for dead.
She was found alive by police and members of the community who were looking for the girls after they were reported missing.
Her horrific account of what happened led police to the shack, where the five-year-old was found and rescued.
She was with the suspect in his bed.
Eastern Cape police provincial commissioner Lt-Gen Liziwe Ntshinga applauded the sentence and expert investigation by the Motherwell Cluster Family Violence, Child Protection and Sexual Offences Unit.
“This was an incredibly difficult case to investigate with the evidence of two minor girls and no eyewitnesses, but today the perpetrator was dealt with by the full force of the law,” said Ntshinga.