Simplify the following text for a Grade 3 native English-speaking person.
Original: The remaining party then goes to Tethe ` alla to find answers , where their goal ultimately changes from saving Sylvarant to saving the two worlds without the sacrifice of the chosens life . In order to do this , they decide that they must sever the ties between Sylvarant and Tethe ` alla to separate the worlds , thus ending the competition for mana .
Simplified: They go to a different world called Tethe ` alla .