Complex sentence: Gabey takes Ivy on an imaginary date down "Mainstreet" in a studio in Carnegie Hall, and all the couples meet at the top of the Empire State Building to celebrate a night "On the Town".
Split into simpler sentences: Gabey takes Ivy on an imaginary date down "Mainstreet" in a studio in Carnegie Hall. That evening, all the couples meet at the top of the Empire State Building to celebrate a night "On the Town".