When a woman and her newborn are placed into quarantine, feared they are infected by the darkness which has devastated their homeworld. She escapes and gains the support of followers to free her twisted child from the prime evil which is bent on possessing their entire species.

Yes the story is a total mind F#$@. Think I will stick with the last one for now. Thanks guys!

Sounds still very complex to me - and complexity I feel is coming from the lack of clarity on the story. There seems to be just too much story forced into the logline.

Or perhaps this version that a former mentor just had a go at:

Set in the future, a mother escapes an alien test facility, rallies the pockets of surviving tribes to find the only one able to save what is left of the planet is her daughter.

Thanks VBK ;-)

Based on the combined feedback I can see my last post is way too long.

Just going from what FFF has offered with his formula breakdown I have simplified it into this =

In the future a mother escapes an alien test facility and rallies the pockets of surviving tribes to find her daughter who is the only one with the ability to save what is left of the planet.

thanks FFF ill have a go at filling it in with your structure to see what i come up with

I love science fiction and I'm familiar with the genre but I still don't understand your logline. I know it's hard to sum up a film in one sentence but you must try to focus, to make it simple, and easy to understand. I give it a try : "In a future Earth ruled by an alien race, a humain mother escapes from a slave factory and join the Resistence to free her daughter who has the key to save mankind". Something like that?