Complex sentence: Vienne was a target during the Migrations Period: it was taken by the Burgundians in 438, re-taken by the Romans and held for 35 years, by the Franks in 534, sacked by the Lombards in 558, and by the Moors in 737.
Split into simpler sentences: Vienne was a target during the Migration Period: it was taken by the Burgundians in 438, but re-taken by the Romans and held for 35 years. It was then sacked by the Lombards in 558, and later by the Moors in 737.