Simplify the following text for a Grade 15 native English-speaking person.
Original: In June 2007 Nash performed at many summer music festvals , for example , O2 Wireless Festival , the Bestival , Electric Gardens , Glastonbury Festival and the Latitude Festival , she also played at the Reading and Leeds Festivals , Oxegen and T in the Park , as well as other festivals .
Simplified: During mid-2007 , Nash performed at numerous festivals including Wireless Festival , Bestival , Electric Gardens , Glastonbury , Latitude , Reading and Leeds , Oxegen and T in the Park .