Complex sentence: The Magic Box has enjoyed its busiest day ever, to Anya's delight.Xander realizes that it is finally the right time to announce his engagement to Anya, and the group make their way back to Buffy's house to celebrate.
Split into simpler sentences: The Magic Box has enjoyed its busiest day ever, to Anya's delight. Xander decides that the time is right to announce his engagement to Anya, and the group make their way back to Buffy's house to celebrate.