There's only a few ways to separate a solid, glass notwithstanding, into two pieces: Break it, burn it, slice it, transmute it, or saw it come to mind. No doubt there are other ways as well but this is the set that comes to mind.
Sawing is just another way to say 'chipping'. That's all that sawing is, chipping away at something.
Of all the ways, ways that are both reasonable and possible, sawing is the most reliable. The scoring and snapping stunt is exactly that, a stunt. Has anyone ever parted a 4x8 sheet into a pair of 2x8's via scoring and snapping?
When I call my supplier and order a quantity of N x M 3mm Nudo panels, they saw them. Always. Since they cut this material orders of magnitude more often that I do, I'll follow their lead. My shop is organized such that there is a fully equipped wood shop in the next room. I can ease over to my table saw and part a piece of composite with about the same amount of time and effort as the always chancy scoring and snapping. The bits of plastic sawdust fall to my air hose.
No matter how you part a composite sheet, never use a deburring tool on its edges. Rather reform them back to flat by running a piece of brass stock over them. Deburring removes material thus changing the size of the piece. Reforming merely changes its shape back to flat.