Complex sentence: There are no written continental sources to confirm or refute this but archaeological evidence showing a burning of Ladoga in the late 10th century was unearthed by Soviet archaeologists in the 1980s.
Split into simpler sentences: There are no written continental sources to confirm or refute this. But archaeological evidence showing a burning of Ladoga in the late 10th century was unearthed by Soviet archaeologists in the 1980s.