Complex sentence: The most important architectural heritage of the southern part of Upper Lusatia is the so-called "Umgebindehäuser", special, half-timbered houses which unite the differences of the Slavic and the Franconian styles of wooden houses.
Split into simpler sentences: The most important arcitectural heritage of the southern part of Upper Lusatia is the so called "Umgebindehäuser". They are special, half-timbered houses which unite the differences of the Slavic and the Franconian styles of wooden houses.