Complex sentence: Four Jesuits and one unidentified woman hid in the monastery's kitchen (behind the stack of firewood), while the others found shelter in the monastery's boiler room when they also met a man who had hid there prior to the massacre.
Split into simpler sentences: Four Jesuits and one unidentified woman hid in the monastery's kitchen (behind the stack of firewood). The other nine found shelter in the monastery's boiler room when they also met a man who had hide there prior to the massacre.