Simplify the following text for a Grade 6 native English-speaking person.
Original: When they return to the mortal world , they send off Clarisse on an airplane to camp alone , and Percy , Annabeth , Grover , and Tyson are kidnapped by Luke .
Simplified: When they return to the mortal world , they send Clarisse on an airplane with the Fleece to camp . Percy , Annabeth , Grover , and Tyson are kidnapped by Luke .