I'd just use a chain tool to take a pin most of the way out of a link and then simply unwrap the chain and when that's done put it on a long board or surface that I know is straight and see if the chain got twisted. If the chain is twisted I'd get a new one. If the chain isn't twisted I'd put it back on but use a quick-link of some type to join it. That'd entail taking out 1/2 of a link. If it's an 8 speed chain or less then you can probably put it back together with the chain tool. I think in your case though a quick-link would be a better join.

Cheers