Complex sentence: His son Antigonus offered all his possessions, and even his own person, in order to procure his father's liberty, but all proved unavailing, and Demetrius died after a confinement of three years (283 BC).
Split into simpler sentences: His son Antigonus offered all his possessions, and even his own person, in order to procure his father's liberty. But all proved unavailing, and Demetrius died after a confinement of three years (283 BC).