Complex sentence: Food was ordered at the concession counter on the way in, then brought to the seat/table when it was prepared; patrons received a mildly glow-in-the-dark number to help the staff find them during the movie.
Split into simpler sentences: Food was ordered at the concession counter on your way in, then brought to your seat/table when it was prepared. Patrons received a mildly glow-in-the-dark number to help the staff find you during the movie.