Complex sentence: It is a period widely known in European history as the Migration Period, also the "Völkerwanderung" ("migration of peoples" in German), and was a period of intensified human migration in Europe from about 400 to 800.
Split into simpler sentences: It is a period widely known in European history as the Migration Period, also the "Völkerwanderung" ("migration of peoples" in German). This was a period of intensified human migration in Europe from about 400 to 800.