Complex sentence: Ice and Grizz take a liking to Lucy and the three strike an instant friendship, something Panda got jealous over which resulted in him lying that they were sick to have a sort of "date" with Lucy.
Split into simpler sentences: Ice and Grizz take a liking to Lucy and the three strike an instant friendship. Something Panda got jealous over and tried lying that they were sick to have a sort of "date" with Lucy.