Cut it into 18" rounds, get a splitting maul, and have at it. If the wood is knotty, don't bother with it. Likewise if sycamore. All you'll do is wear yourself out. Hackberry and hickory can be a little stringy, but manageable. Pro tip, instead of trying to split every piece in half, it's much easier with bigger rounds to work the edges and take off sharp corners as you chop pieces off.