Complex sentence: The Norse sagas, Saxo Grammaticus and Adam of Bremen describe the sacrifices at Uppsala as popular festivals attracting people from all over Sweden, and many of these sources provide accounts of human sacrifice for the Norse gods.
Split into simpler sentences: The Norse sagas, Saxo Grammaticus and Adam of Bremen describe the sacrifices at Uppsala as popular festivals that attracted people from all over Sweden. Many of these sources provide accounts of human sacrifice for the Norse gods.