Complex sentence: The medieval bridge is of a cantilever construction of granite with three arches dating back to the 12th century; the voussoir (arching bricks) are straight, extra-hard but irregular, with the central arch the largest of the construction.
Split into simpler sentences: The medieval bridge is of a cantilever construction of granite with three arches dating back to the 12th century. The voussoir (arching bricks) are straight, extra-hard but irregular, with the central arch the largest of the construction.