Simplify the following text for a Grade 11 native English-speaking person.
Original: In the lead-up to Germany 's international football matches , Paul ( or a similar octopus ) was presented with two clear plastic boxes , each containing food : a mussel or an oyster .
Simplified: In the lead-up to Germany 's international football matches , Paul was presented with two clear plastic boxes , each containing food : the soft parts of a mussel .