Complex sentence: In 2003, they were featured in "Sabrina, The Teenage Witch" as the main performers for Sabrina's boyfriend and future fiance's club also Nash hit-on Harvey Kinkle, Sabrina's old boyfriend as a joke.
Split into simpler sentences: In 2003, they were featured in "Sabrina, The Teenage Witch" as the main performers for Sabrina's boyfriend and future fiancé's club. Also, Nash hit-on Harvey Kinkle, Sabrina's old boyfriend as a joke.