Complex sentence: However, it is primarily spread by transport of firewood and other wood products that contain ash bark, which allows EAB to spread to new areas to create satellite populations outside of the main infestation and quickly increase its range.
Split into simpler sentences: However, it is primarily spread by transport of firewood and other wood products that contain ash bark. This allows EAB to spread to new areas to create satellite populations outside of the main infestation and quickly increase its range.