Complex sentence: The other writings he claims are two anonymous volumes of "Sermons concerning all the Saints" whose yearly feasts the church celebrates 3f these volumes, he adds, one is very diffuse, but the other short and concise.
Split into simpler sentences: The other writings he claims are two anonymous volumes of "Sermons concerning all the Saints" whose yearly feasts the church celebrates. Of these volumes, he adds, one is very diffuse, but the other short and concise.