Simplify the following text for a Grade 5 native English-speaking person.
Original: The prediction process was designed so that Paul was presented with two boxes containing food in the form of a mussel , each box marked on the outside with the flag of a national football team in an upcoming match .
Simplified: During the divinations , Paul was shown two boxes with a mussel inside them , for food . Each box had , on the outside , a flag of a football team .