Complex sentence: She sometimes finds Class 6-3 in situations where she thinks the class is perverted; given that this often happens with Yabecchi, who fancies her, she is given the nickname "Kuriyamacchi" by the triplets.
Split into simpler sentences: She sometimes finds Class 6-3 in situations where she thinks the class is perverted. She is given the nickname "Kuriyamacchi" by the triplets.