Complex sentence: There, he was successful in introducing English and Flemish methods of farming, allowing him in 1796 to build a Neoclassical manor at Bækkeskov, which he surprisingly sold again in 1805 for reasons unknown.
Split into simpler sentences: There, he was successful in introducing English and Flemish methods of farming. He built a Neoclassical manor at Bækkeskov but surprisingly sold it again in 1805 for reasons unknown.