Simplify the following text for a Grade 9 native English-speaking person.
Original: On 15 October 184 at the Capitoline Games , a Cynic philosopher publicly denounced Perennis before Commodus , who was watching , but was immediately put to death .
Simplified: On 15 October 184 at the Capitoline Games , a Cynic philosopher publicly denounced Perennis before Commodus , who was watching . He was immediately put to death .