Complex sentence: The Second Punic War was fought between Carthage and Rome and was ignited by the dispute over the hegemony of Saguntum, a Hellenized Iberian coastal city with diplomatic contacts with Rome.
Split into simpler sentences: The Second Punic War was fought between Carthage and Rome. The war was ignited by the dispute over the hegemony of Saguntum, a Hellenized Iberian coastal city with diplomatic contacts with Rome.