Complex sentence: All of Dodgson's books (except 100 copies of the "Mission Hymn Book"), the harmonium, and most of his stores were lost, but the communion vessels were saved, as was a stone font.
Split into simpler sentences: All of Dodgson's books (except 100 copies of the "Mission Hymn Book"), and most of his stores, were lost. The communion vessels were saved, as was a stone font.