Complex sentence: The legend about the mace of Peroun, thrown in the Great bridge, was seminal and linked with the Novgorodian tradition to arrange wrestling battles between the citizens of different districts of the medieval city.
Split into simpler sentences: The legend about the mace of Peroun, thrown in the Great bridge, was seminal and linked with a Novgorodian tradition. The tradition was about arranging wrestling battles between the citizen of different districts of the medieval city.