Complex sentence: The Paphlagonian expedition of the Rus'was an attack by the Rus' on the city of Propontis, marking the first known contact between the Rus' and the Byzantine Empire.
Split into simpler sentences: The Paphlagonian expedition of the Rus'was an attack by the Rus' on the city of Propontis. It marked the first known contact between the Rus' and the Byzantine Empire.