Complex sentence: By 1903, Ward oversaw the excavations on the site and by 1905, he published an article, along with an architect and historian, on the castle which stated that it was an 13th century castle.
Split into simpler sentences: By 1903, Ward oversaw the excavations on the site. By 1905, along with an architect and historian, he published an article on the castle which stated that it was an 13th century castle.