So he'll be eligible to be out of prison in 11 years if people generally serve half a custodial sentence?
Concurrent, not consecutive. The sentences run together, not added together.
So he'll be eligible to apply to a parole board for release at the end of his tariff, in ten years. He would have been eligible for release half way (ish) through the 12 year determinate sentence, but that does not trump the tariff on his life sentence.
It is for the parole board to decide what to do for the best. Less than 10% of first-time parole applications succeed. I was kind of hoping we weren't in Daily Mail land in which parole boards are hopeless wet liberals easily deluded into releasing dangerous criminals, but it would appear not.
Connelly was profoundly damaged by her abusive parents, and gathered around her other damaged men. They committed a horrible crime (or crimes) for which they are, justly, being punished. Parole boards will see evidence of what progress they make as people, and on the vague assumption that we life in a civilised society that believes that people are capable of redemption, I'm happy for parole boards to make that judgement. The recidivism rate for people released from life sentences is fairly low and in this case, the chances of them having access to children again is approximately zero.
Although it makes everyone feel better to imagine these were scheming cold-blooded evil men and women, they appear to have mostly been stupid, indolent and vile. Psychopathy is hard to fix; the effects of poor upbringings (which all of them had) might be repairable. It is for parole boards to decide that, a job they usually do pretty well.