Complex sentence: The Buren County in the present province of Gelderland was (until the establishment of the Batavian Republic in 1795) an independent county, which although not formally part of the United Provinces was in practice it was governed by it.
Split into simpler sentences: The Buren County in the present province of Gelderland, the Netherlands, was an independent county until the establishment of the Batavian Republic in 1795. Although it was not formally part of the United Provinces, in practice it was governed by it.