Complex sentence: Occasionally there are unexpected surprises, like when, during a shape hideout Telly Monster is hiding in the triangle or when one day Bert decides to hide instead of Ernie and let us not forget the episode when Ernie wants Big Bird to hide so he could seek.
Split into simpler sentences: Occasionally there are unexpected surprises, like when, during a shape hideout Telly Monster is hiding in the triangle. And let us not forget the episode when Ernie wants Big Bird to hide so he could seek.