Complex sentence: Although the child cannot understand the purpose, the ceremony helps the parents to realize that they have to shape their child into good citizen, and to show a bright future for the child, and the guests to realize the greatness and sweetness of human life.
Split into simpler sentences: Although the child cannot understand the purpose, the ceremony helps the parents to realize that they have to shape their child into a good citizen and show a bright future to the child. It also helps the guests to realize the greatness and sweetness of human life.