ORIGINAL: ...It is a foam plane but the gear is mounted to what looks like ply. The wood broke in a clean line but I was wondering what would be the best glue to fix this, and how would I add some supporting properties to this so it wont happen again? It seems like the wood used is a little thin and maybe not supported as well as it could be.
Welcome to the forum!
A torsion-block system has worked well for me. It provides a lot of spring to the landing gear and does not take up too much room in the fuselage to install. If the blocks are glued carefully, they will not tear out. Here's one I'm installing in a micro Telemaster. The landing gear consists of two wires anchored in a slotted block to create a twisting action in the wires.