Complex sentence: The figure of Beowulf corresponds with a number of other contemporary figures known in the same place and time but since centuries of oral traditions have modified a number of events and it is no longer possible to find 100% matches between Beowulf and Scandinavian sources.
Split into simpler sentences: The figure of Beowulf corresponds with a number of other contemporary figures known in the same place and time. However, since centuries of oral traditions have modified a number of events, it is no longer possible to find 100% matches between Beowulf and Scandinavian sources.