Complex sentence: On Good Friday of 1688 a relief force returned and found twelve survivors; the chaplain of the relief force, Jesuit Father Pierre Millet, erected a cross and gave a mass of thanksgiving for their survival.
Split into simpler sentences: On Good Friday of 1688 a relief force returned and found twelve survivors. The chaplain of the relief force, Jesuit Father Pierre Millet, erected a cross and gave a mass of thanksgiving for their survival.