Simplify the following text for a Grade 6 native English-speaking person.
Original: BBC Radio 4 Extra , formerly known as BBC 7 and BBC Radio 7 , is a British digital radio station broadcasting comedy , drama , and children 's programming nationally 24 hours a day .
Simplified: It plays comedy , drama , and children 's programs 24 hours a day . It was called BBC 7 when it started in 2002 and was later renamed BBC Radio 7 in 2008 .