Complex sentence: Among the French chronicles are the narratives of Martin Du Bellay and Blaise de Montluc, both of whom were present at the scene; the Sieur de Tavannes, who accompanied Enghien, also makes some mention of the events in his memoirs.
Split into simpler sentences: Among the French chronicles are the narratives of Martin Du Bellay and Blaise de Montluc, both of whom were present at the scene. The Sieur de Tavannes, who accompanied Enghien, also makes some mention of the events in his memoirs.