Complex sentence: In 133 BC, Attalus III, king of Pergamon, having no heirs to succeed him, bequeathed his kingdom to Rome, and after some hesitation the Roman province of Asia Proconsularis was formed, embracing the regions of Mysia, Lydia, Caria, and Phrygia.
Split into simpler sentences: In 133 BC, Attalus III, king of Pergamon, having no heirs to succeed him, bequeathed his kingdom to Rome. After some hesitation the Roman province of Asia Proconsularis was formed, embracing the regions of Mysia, Lydia, Caria, and Phrygia.