My son was in a wreck and his phone was crushed is there any way I can find out what was on the phone if I connect it to my computer
Assuming the phone has no security lock enabled, you should be able to see the media it contains if connected to a computer. If it has a memory card, you can try and use it on another device.
Assuming the phone is synced to an online account, its contacts, messages, etc. may be accessed by visiting the account online through a computer, preferably.
The only other choice I see is to repair it.