thats a tough call whether it could be repaired or not. epoxy might work, but it depends on how far into the limb the split went. i dont think i would use screws, maybe just some good hardwood dowels punched into it tight , then a wrap of either sinew or hemp set in epoxy or a massey finish. be sure to pull it from afar with a rope at first, theres no guarantee itll even hold up after being repaired. good luck.