Complex sentence: The Novena to Our Mother of Perpetual Help is a set of Roman Catholic novena prayers originally published in Jaén, Spain in 1899, then widely republished by American Redemptorist priests in 1927, then ultimately revised by Irish and Australian Redemptorist priests in 23 June 1948.
Split into simpler sentences: The Novena to Our Mother of Perpetual Help is a booklet containing a set of prayers including the Roman Catholic novena to Our Mother of Perpetual Help, that was originally published in Jaén, Spain in 1899. It was then widely republished by American Redemptorist priests in 1927, then ultimately revised by Irish and Australian Redemptorist priests in 23 June 1948.