Simplify the following text for a Grade 8 native English-speaking person.
Original: On March 28 , 2005 , Atlanta-based Turner Broadcasting split Adult Swim from Cartoon Network so Nielsen Media Research could treat it as a separate channel for ratings purposes .
Simplified: On March 28 , 2005 , Nielsen Media Research shows that Adult Swim is now separate from Cartoon Network ( like Nickelodeon 's Nick at Nite ) . Adult Swim is part of Turner Broadcasting System .