Simplify the following text for a Grade 13 native English-speaking person.
Original: The games have been credited with making the Winter Olympics more popular in the United States , not least of which because of ABC 's extensive coverage of Fleming and Killy , who became overnight sensations among teenage girls .
Simplified: The games have been credited with making the Winter Olympics more popular in the United States , largely because of ABC 's coverage of Fleming and Killy , who became very popular among teenage girls .