Complex sentence: Himself held to the confessional secret, and not knowing how to justify such a treasure in his church, the priest of Juillé gave the object to the Vicar of le Mans through on offering to the Virgin Mary.
Split into simpler sentences: Himself held to the confessional secret, and not knowing how to justify such a treasure in his church. The priest of Juillé gave the object to the Vicar of le Mans through on offering to the Virgin Mary.