Complex sentence: There is no evidence to substantiate these medieval claims of its origin with Attila; the sword, in the Kunsthistorisches Museum, Vienna, as part of the Habsburg "Schatzkammer" in fact appears to be the work of ninth or tenth century Hungarian goldsmiths.
Split into simpler sentences: There is no evidence to substantiate these medieval claims of its origin with Attila. The sword, now in the Kunsthistorisches Museum of Vienna as part of the Habsburg "Schatzkammer", in fact appears to be the work of ninth or tenth century Hungarian goldsmiths.