Take it apart to the point where you have that gold plastic piece that's broken separate from everything else. Lay it out flat, see if it will just lay in the exact proper position by itself or if you need to brace it together. Lay down a piece of bracing material (metal rod ?) in either one of those inside corners so it spans the break and runs to either end of that space. run a fat line of epoxy down in the corner, push your rod down into it, make sure the piece is in the proper position, leave it to dry overnight.
The next day you may want to run more epoxy not