Complex sentence: Once he reaches the balcony the staff hides the rag doll and a human Celedón comes out who has to cross the square, helped by a group of friends, to reach the church of San Miguel to greet the crowds below and wish everyone a happy celebration.
Split into simpler sentences: Once he reaches the balcony the staff hide the rag doll and a human Celedón appears. Next, he has to cross the square, helped by a group of friends, to reach the Church of San Miguel and greet the crowds below and wish everyone a happy celebration.