Complex sentence: Bad weather and difficult roads hampered the 1st Army's pursuit of the Ottomans after the battle of Kumanovo, forcing the Morava Division to move ahead of the Drina Division.
Split into simpler sentences: Bad weather and difficult roads hampered the 1st Army's pursuit of the Ottomans after battle of Kumanovo. Road conditions forced the Morava Division to move ahead of the Drina Division.