Complex sentence: There have been several moments that confirm that Ruby has a crush on him, such as in the episode "Quadro-Gloomia" when Frank and Len get inside Ruby's head and experience her feelings for Skull Boy first hand.
Split into simpler sentences: There have been several moments that confirm that Ruby has a crush on him. This is confirmed in the episode "Quadro-Gloomia" when Frank and Len get inside Ruby's head and experience her feelings for Skull Boy first hand.