Complex sentence: The commander of the fort, Bernardo Muñoz Vargas, made some advances in the urban regulatory plan, as to dumps, open streets, and place a wooden bridge over the river Traiguén.
Split into simpler sentences: The commander of the fort, Bernardo Muñoz Vargas was responsible for some of the early urban planning. Creating some dumps, open streets, and a wooden bridge crossing the nearby river Traiguén.