Complex sentence: The inability of the Ottomans to capture Vienna in 1529 turned the tide against almost a century of conquest throughout eastern and central Europe, which had previously directly annexed Central Hungary and established a vassal state in Transylvania in the wake of the Battle of Mohács.
Split into simpler sentences: The inability of the Ottomans to capture Vienna in 1529 turned the tide against almost a century of conquest throughout eastern and central Europe. The Ottoman Empire had previously annexed Central Hungary and established a vassal state in Transylvania in the wake of the Battle of Mohács.