Complex sentence: Nicetas, Heraclius'cousin, continued to resist the Persians, but was defeated at Adhri'at, although he managed to win a small victory near Emesa, where both sides suffered heavy casualties: some 20,000 reportedly died.
Split into simpler sentences: Nicetas, Heraclius'cousin, continued to resist the Persians, but was defeated at Adhri'at. He managed, however, to win a small victory near Emesa, where both sides suffered heavy casualties: some 20,000 reportedly died.