Simplify the following text for a Grade 10 native English-speaking person.
Original: In the quiz-type Reward Challenge where Gregg won , he unleashed his true colors as he selected Jenn and Katie over Caryn , Ian , and Tom on a luxury yacht trip , angering the trio .
Simplified: In the quiz-type Reward Challenge where Gregg won , he showed his true colors when he chose Jenn and Katie over Caryn , Ian , and Tom on a luxury yacht trip , making the three of them mad .