Complex sentence: When the runners met, the Carthaginian pair had covered more ground; accused of cheating by the Greeks, they consented to be buried alive on the meeting spot, so that the territory between that spot and Carthage would become part of the Carthaginian domain.
Split into simpler sentences: When the runners met, the Carthaginian pair had covered more ground. Accused of cheating by the Greeks, they consented to be buried alive on the meeting spot, so that the territory between that spot and Carthage would become part of the Carthaginian domain.