Complex sentence: Thankfully his plan only half worked, The Varden and The Dwarves were not destroyed, but unfortunately the Urgal race was depleted that only a few thousand were still left, on another note, Durza, the commander of the Urgal troops also died.
Split into simpler sentences: Thankfully his plan only half worked, as the Varden and the Dwarves were not destroyed, but unfortunately the Urgal race was depleted that only a few thousand were still left. On another note, Durza, the commander of the Urgal troops, also died.