Complex sentence: It is assumed that Bar was mentioned as the reconstructed Roman castle, "Antipargal", in the 6th century, with the name "Antibarium" being quoted for the first time in the 10th century.
Split into simpler sentences: It is assumed that Bar was mentioned as the reconstructed Roman castle, "Antipargal", in the 6th century. The name "Antibarium" was quoted for the first time in the 10th century.