The broken pieces in the pictures are called wing ribs. The spars are the pieces that go into the grooves in the ribs from center to tip normally about 1/4" square at the thickest part of the wing top and bottom.

There are several ways to make the repairs. If all the pieces are there and can be aligned then thin CA will do the trick. You may need to add some wood and then reform the airfoil if the top curve is missing. The ribs seem to have a large portion removed probably to lighten the structure. Adding some small pieces vertically will help keep the airfoil shape and add a lot of strength.

EXCAP232