Complex sentence: The girls in Ginger's age group (Dodie, Courtney, Macie, Miranda and Ginger herself) and some of the adults were the only ones to do this at first; after Darren got his orthodontia removed, he changed clothes as well.
Split into simpler sentences: The girls in Ginger's age group (Dodie, Courtney, Macie, Miranda and Ginger herself) and some of the adults were the only ones to do this at first. But after Darren got his orthodontia removed, he changed clothes as well.