Complex sentence: It is considered the first brownstone constructed west of the Mississippi River and, with the Fairmont Hotel across the street, were the only structures in the area to survive the San Francisco earthquake and fire of 1906.
Split into simpler sentences: It is considered the first brownstone constructed west of the Mississippi River. Along with the Fairmont Hotel across the street, these were the only structures in the area to survive the San Francisco earthquake and fire of 1906.