Complex sentence: Of Juan Álvarez Mendizábal of 1837 and Madoz in 1855, it was left almost without resources to the municipality of Llerena he lost the dehesas of their property and that he had maintained and exploited for centuries by providing significant benefits for the municipal coffers.
Split into simpler sentences: Of Juan Álvarez Mendizábal of 1837 and Madoz in 1855, it was left almost without resources to the municipality of Llerena. He lost the dehesas of their property that he had maintained and exploited for centuries by providing significant benefits for the municipal coffers.