Simplify the following text for a Grade 6 native English-speaking person.
Original: The performance was followed by follow-up comeback performances on MBC 's Music Core and SBS 's Inkigayo on June 27 and 28 , 2009 .
Simplified: The group then had their return performances on MBC 's Music Core and SBS 's Inkigayo on June 27 and 28 , 2009 .