Complex sentence: Most of the sprayed forests were still "in good condition" in 1968, and, although a scattering of dead trees occurred throughout the region, in no case did mortality destroy a major operating unit or disrupt a long-term management plan.
Split into simpler sentences: Most of the sprayed forests were still "in good condition" in 1968. Although a scattering of dead trees occurred throughout the region, in no case did mortality destroy a major operating unit or disrupt a long-term management plan.