Simplify the following text for a Grade 10 native English-speaking person.
Original: The season goes around the protagonist , Aang , and his friends Katara and Sokka and their journey to the North Pole ( to North Water Tribe ) to find a Waterbending master to teach Aang and Katara how to control water .
Simplified: The season revolves around the protagonist , Aang , and his friends Katara and Sokka and their journey to the North Pole to find a Waterbending master to teach Aang and Katara .