Complex sentence: But across the street from Millicent's is Jacqueline with her assistant Delphine, when they see the Flairies, they plan to Flairynap Shimmer, Glimmer, and Shyne.
Split into simpler sentences: But across the street from Millicent's is Jacqueline with her assistant Delphine. When they see the Flairies, they plan to kidnap Shimmer, Glimmer, and Shyne.