Pretty much echoing what has been said previously, but the way I would repair this would be:
- Over the damaged area in glue, ensuring plenty has seeped into the visable crack.
- Using a g-clamp, lightly clamp the area (approximately 75% closed)
- Using a vice (if available), clamp the bat together to ensure the repair is 'straight'
- Completely close the crack by securing the G-Clamp.
- Using 6mm hardwood dowel, insert 2 -3 sections for extra strength
- A layer of bat tape and a scuff sheet to finish!