Complex sentence: In 973, Esztergom served as the starting point of an important historical event: during Easter of that year, Géza sent a committee to the international peace conference of Emperor Otto I in Quedlinburg.
Split into simpler sentences: In 973, Esztergom served as the starting point of an important historical event. During Easter of that year, Géza sent a committee to the international peace conference of Emperor Otto I in Quedlinburg.