Complex sentence: Marshall's research at the Experimental Station focused on the dynamics of forest regeneration after fires, but he was faced with the task of fighting an actual fire after a July storm started more than 150 fires in Idaho's Kaniksu National Forest.
Split into simpler sentences: Marshall's research at the Experimental Station focused on the dynamics of forest regeneration after fires. He had to fight a widespread fire after a July storm started more than 150 fires in Idaho's Kaniksu National Forest.