Complex sentence: A new silver papal tiara to replace the destroyed ones was only manufactured in 1820, but the papier-mâché tiara continued in usage for decades afterwards, its lightweight design making it a comfortable alternative to the heavier silver alternative for popes as they aged.
Split into simpler sentences: A new silver papal tiara to replace the destroyed ones was only manufactured in 1820. However the papier-mâché tiara continued in usage for decades afterwards, its lightweight design making it a comfortable alternative to the heavier silver alternative for popes as they aged.