Original sentence: As speakers of a Germanic language, it is believed that at least a dominant class of Goths migrated from the direction of modern Poland, where such languages are believed to have been spoken at this time.During the subsequent centuries, the Wielbark culture expanded southwards towards the Black Sea, where by the late 3rd century AD it contributed to the formation of the Chernyakhov culture, which is associated with the Goths.They were first definitely reported by Graeco-Roman authors in the third century, living north of the Danube in what is now Ukraine, Moldova and Romania
Edited sentence: During the subsequent centuries, the Wielbark culture expanded southwards towards the Black Sea, where it by the late 3rd century AD contributed to the formation of the Chernyakhov culture, which is associated with the Goths.They were first definitely reported by Graeco-Roman authors living north of the Danube in what is now Ukraine, Moldova and Romania