What may have happened if you ran your car too long with no oil and it cut off while driving and wont start at all?

The list is endless. The rings have scored into the cylinder walls so bad you have no compression is the most likely if the starter turns the engine but it won't start.

But while you were at it, every bearing from the main bearings on the crankshaft to the ends of the push rods have been damaged to one degree or another. If the engine ever starts again, run it as is, don't waste a single dollar on it when it stops running as it will never be worth it no mater how much you replace.