Complex sentence: The artwork for the single features the same image of Prince that was used for the cover of "I Would Die 4 U", the extended version of which is the B-side of "Erotic City".
Split into simpler sentences: The artwork for the single features the same image of Prince that was used for the cover of "I Would Die 4 U". The extended version of the latter was included as the the B-side of "Erotic City".