Simplify the following text for a Grade 13 native English-speaking person.
Original: Before he retired from the weekday breakfast program Wake Up to Wogan on BBC Radio 2 on 18 December 2009 , Sir Terry had a regular 8 million listeners , making him the most listened-to radio broadcaster of any European nation .
Simplified: Before he retired from the weekday breakfast program Wake Up to Wogan on BBC Radio 2 on 18 December 2009 , Sir Terry had a regular 8 million listeners , making him the most listened to radio broadcaster of any European nation .