Complex sentence: Lucia pities Santuzza who is considered by the villagers to be excommunicated because of her seduction, cannot enter the church, but begs Lucia to go inside and pray for her.
Split into simpler sentences: Lucia pities Santuzza, who is considered by the villagers to be excommunicated because of her seduction. Santuzza cannot enter the church, but begs Lucia to go inside and pray for her.