Complex sentence: He saw the beauty and impressiveness of the originals documents and felt that a print made from the photographs would be a sacrilege, so he commissioned a fine letterer, who had been in his employ, to supply the missing letters and words.
Split into simpler sentences: He saw the beauty and impressiveness of the originals documents and felt that a print made from the photographs would be a sacrilege. So he commissioned a fine letterer, who had been in his employ, to supply the missing letters and words.