Complex sentence: Upon Chlodomer's death, his three sons, Theodebald, Gunther, and Clodoald, were entrusted to care of their grandmother, hence the young princes were raised in Paris by Chlodomer's mother, Chlotilde.
Split into simpler sentences: Upon Chlodomer's death, his three sons, Theodebald, Gunther, and Clodoald, were entrusted to care of their grandmother. So the young princes were raised in Paris by Chlodomer's mother, Chlotilde.