Complex sentence: In 1683, the Austrians and the Poles defeated the Ottomans at the gates of Vienna and in 1686, conquered Buda, and in 1690, Transylvania, abolishing the principality.
Split into simpler sentences: In 1683, the Austrians and the Poles defeated the Ottomans at the gates of Vienna. In 1686, they conquered Buda, and in 1690 took over Transylvania, abolishing the principality.