Complex sentence: He promised to return if the city came under Persian threat, but Procopius accuses Bouzes of simply vanishing, with neither the Hierapolitans or the Sassanids able to locate him.
Split into simpler sentences: He promised to return if the city came under Persian threat. But Procopius accuses Bouzes of simply vanishing, with neither the Hierapolitans or the Sassanids able to locate him.