Simplify the following text for a Grade 10 native English-speaking person.
Original: Though having won the flint as well as Immunity , Koror had a mishap as their outrigger capsized and their newly-acquired crate full of fire-making essentials sank in deep water .
Simplified: Though having won the flint as well as Immunity , Koror had a problem as their carrier flipped and their box full of fire-making supplies sank in deep water .