Complex sentence: They had been left alone in the camp to do their drafting work when the attack occurred, which it was suggested was in retribution for the slaying of several natives after the murder of Marie Ward at escape Cliffs several years before.
Split into simpler sentences: They had been left alone in the camp to do their drafting work when the attack occurred. It was suggested the attack was in retribution for the slaying of several natives following the murder of Marie Ward at escape Cliffs several years before.