Simplify the following text for a Grade 14 native English-speaking person.
Original: He and several other characters ( Katara 's Waterbending master Pakku , Aang 's first Firebending instructor Jeong Jeong , Aang 's Earthbender friend King Bumi , and Sokka 's swordmaster Piandao ) are part of an otherwise non-aligned group known as the `` Order of the White Lotus '' , which plans to liberate the Earth Kingdom capital , Ba Sing Se , from Fire Nation rule .
Simplified: He and several other characters ( Pakku , Jeong Jeong , King Bumi and Piandao ) are part of an otherwise non-aligned group known as the `` Order of the White Lotus '' , which plans to liberate the Earth Kingdom capital , Ba Sing Se , from Fire Nation rule .