Complex sentence: In 133 BC, when Eumenes III, the last king of the Attalid dynasty of Pergamum, was about to die without an heir, he bequeathed his kingdom to the Roman Republic in his will, and this included Smyrna.
Split into simpler sentences: In 133 BC, when Eumenes III, the last king of the Attalid dynasty of Pergamum, was about to die without an heir. In his will, he bequeathed his kingdom to the Roman Republic, and this included Smyrna.