Complex sentence: In 1814 he also wrote an article titled "To the Innocent, Serious, and Magnanimous of my Fatherland," a testimony to the many people living in poverty which his institutions could not reach.
Split into simpler sentences: In 1814 he also wrote an article titled "To the Innocent, Serious, and Magnanimous of my Fatherland". It is a testimony to the many people living in poverty which his institutions could not reach.