Complex sentence: During his war on Spain in the year 542, King Childebert besieged Zaragoza, upon hearing the inhabitants had placed themselves under the protection of the martyr St. Vincent of Saragossa, Childebert raised his siege and spared the city.
Split into simpler sentences: During his war on Spain in the year 542, King Childebert besieged Zaragoza. Upon hearing that the inhabitants had placed themselves under the protection of the martyr St. Vincent of Saragossa, Childebert raised his siege and spared the city.