Complex sentence: They cannot have such a value unless a high-ranking bishop is writing a more solemn text, and not a mere theological opinion; otherwise, "L'Osservatore" does not have the authority to write or approve encyclicals and papal allocutions.
Split into simpler sentences: They cannot have such a value unless a high-ranking bishop is writing a more solemn text, and not a mere theological opinion. Otherwise, "L'Osservatore" does not have the authority to write or approve encyclicals and papal allocutions.