Complex sentence: The refugee problem has begun unfolding across Syrian borders, intensifying with the siege of Talkalakh and unrest in the Syrian province of Idlib, near the Turkish border, thousands of Syrian citizens fled across the border to Lebanon and Syria.
Split into simpler sentences: The refugee problem has begun unfolding across Syrian borders, intensifying with the siege of Talkalakh and unrest in the Syrian province of Idlib, near the Turkish border. As a result, thousands of Syrian citizens fled across the border to Lebanon and Syria.