Complex sentence: Born the fourth child of Amable Troude, Onésime-Joachim Troude had a career in the French Navy, rising to the rank of Capitaine de frégate.
Split into simpler sentences: Born the fourth child of Amable Troude, Onésime-Joachim Troude had a career in the French Navy. He later rose to the rank of Capitaine de frégate.