Complex sentence: The Russo-Turkish War of 1828-1829 did not give him time to organize a new army, and the Sultan was forced to fight with these young and undisciplined recruits against the veterans of the Tsar.
Split into simpler sentences: The Russo-Turkish War of 1828-1829 did not give him time to organize a new army. He fought with these young and undisciplined recruits against the veterans of the Tsar.