Original: He then set off with Katara and Aang on their journey to find a waterbending instructor at the North Pole, determined to hone his warrior skills by way of fighting a few Firebenders along the way.
Simplified: He then set off with Katara and Aang on their journey to find a waterbending master at the North Pole, determined to hone his warrior skills by way of fighting Firebenders along the way.