Complex sentence: Outside its native range, it is an invasive species and is highly destructive to ash trees native to North America that local governments are attempting to control it with monitoring its spread, diversifying urban tree species, insecticides, and biological control.
Split into simpler sentences: Outside its native range, it is an invasive species and is highly destructive to ash trees native to North America. Local governments in North America are attempting to control it by monitoring its spread, diversifying tree species, insecticides, and biological control.