Complex sentence: Kame-Sen'nin (Master Roshi) uses the technique "drunken boxing" on Goku in the finals of "The World Martial Arts Tournament", as a reaction to this Goku uses a new technique he calls the "crazy monkey technique".
Split into simpler sentences: Kame-Sen'nin (Master Roshi) uses the technique "drunken boxing" on Goku in the finals of "The World Martial Arts Tournament". As a reaction to this, Goku uses a new technique called the "crazy monkey technique".