If it was me, I'd take an embrodery or upholstry needle and punch holes in the broken bones, then thread through with clear fishing line, then reenforce with some hot glue maybe? It doesn't look too bad, just cosmetic damage from the pic, so if you get the bones back in a reasonable arrangement it might be okay. Of course, if it's worse than cosmetic, I'd probably take that mesh/bone structure off to make it easier to work on, and see about using some dollar store bones to recreate the collarbone/chest area (xacto knife to cut out some replacement spint/bones using the broken ones as a template, and then glue down over the broken areas or replace all together and repaint).