It looks like there’s a long piece that connected two balls that go into sockets on either end. If that’s correct, and you want to repair the long piece so it doesn’t break again, you want to pin it. That means drilling into both sides of the break and putting something stronger to act as a bridge through both holes. There are bunches of tutorials on how to do it like this one spikeybits.com/…/this-is-how-to-pin-metal-miniatu… (just an example, you can probably find better ones)