Complex sentence: Before Billy gets his dogs, he learns his grandpa is selling a Bluetick coonhound, and goes to see him, however, his rivals, the Pritchards, buy him before he can, just to be mean to Billy.
Split into simpler sentences: Before Billy gets his dogs, he learns his grandpa is selling a Bluetick coonhound. He goes to see him, however, the Pritchards buy him before he can, just to be mean to Billy.