Complex sentence: A very representative element of this carnival are the great "Monigotes" that are placed along the important areas of the city such as decoration, which happen to be giant figures made of papier mache supported by large structures.
Split into simpler sentences: A very representative element of this carnival are the great "Monigotes" that are placed along the important areas of the city decoration. These are giant figures made of papier mache supported by large structures.