Well, my advice would be to glue the pieces back together so you have a longer bow, then glue it back to the stump it so you can cut it during the summer...getting the bark off in the winter is a real bugger. Sorry neither of those are very useful bits of advice! Otherwise, split them, seal the ends, and start working on debarking. (I split before debarking, as bark protects the backs of the staves while you are wooling them around to split.)