Complex sentence: The cornerstone of the Cathedral was laid in 1862; the building was finished in 1874, and dedicated on May 25th of that year by Archbishop Vincent Spaccapietra, Apostolic Delegate to Asia Minor.
Split into simpler sentences: The cornerstone of the Cathedral was laid in 1862. The building was finished in 1874, and dedicated on May 25th 1874 by Archbishop Vincent Spaccapietra, Apostolic Delegate to Asia Minor.