Complex sentence: Polybius 4.19,7-9 Demetrius returned to the Ardiaean State and began to revive Illyrian power however he was beaten by the Romans in 219 BC during the Second Illyrian War.
Split into simpler sentences: Polybius 4.19,7-9 Demetrius returned to the Ardiaean State and began to revive Illyrian power. However, he was beaten by the Romans in 219 BC during the Second Illyrian War.