Simplify the following text for a Grade 9 native English-speaking person.
Original: The season started with two tribes ; an orange tribe , Chuay Gahn ( Thai : `` to help one another '' ) and a purple tribe , Sook Jai ( `` happy heart '' ) .
Simplified: The two initial tribes were Chuay Gahn ( Thai : `` to help one another '' ) and Sook Jai ( `` happy heart '' ) .