Complex sentence: At the beginning of the 1800s, the church was in critical condition, so in 1807 it was pulled down and the project for the construction of the new church was handed to the Bolognese Achille Serra.
Split into simpler sentences: At the beginning of the 1800s, the church was in critical condition. In 1807, it was razed and a project for the construction of the new church was handed to the Bolognese Achille Serra.