Complex sentence: Boaster had retreated when the Romans had crossed the Ebro, furthermore, he was tricked into surrendering the Iberian tribal hostages held at Saguntum to the Romans by a Iberian chieftain named Abylix.
Split into simpler sentences: Boaster had retreated when the Romans had crossed the Ebro. Furthermore, he was tricked into surrendering the Iberian tribal hostages held at Saguntum to the Romans by an Iberian chieftain named Abylix.