Complex sentence: The electric guitar heard in the intro (similar to the blues song "Dust My Broom") shows a blues influence, and the "shoo-bee-do-wop" backing vocals are a reference to Doo Wop music.
Split into simpler sentences: The electric guitar intro (similar to the blues song "Dust My Broom") also shows a blues influence. The "shoo-bee-do-wop" backing vocals are a reference to Doo Wop music.