Simplify the following text for a Grade 10 native English-speaking person.
Original: Noting that Cassioli 's design showed a Roman amphitheatre for what was originally a Greek games , a new obverse design was commissioned for the Athens 2004 Games .
Simplified: Because Cassioli 's design showed a Roman amphitheatre for what was originally a Greek games , a new design was create for the Athens 2004 Games .