Complex sentence: It is said that Honoratus of Amiens, seventh bishop of Amiens (d. ca.600), had discovered in his diocese the relics of these martyrs, and that Childebert had attempted to possess these relics but was prevented from removing them.
Split into simpler sentences: It is said that Honoratus of Amiens, seventh bishop of Amiens (d. ca.600), had discovered in his diocese the relics of these martyrs. Childebert attempted to possess these relics, but was prevented from removing them.