However, the burning of fossil fuels increases the nitric oxide in the atmosphere so that abnormally high levels of ozone are produced.
(the burning of fossil fuels; increases; the nitric oxide; so that abnormally high levels of ozone are produced) (abnormally high levels of ozone; are produced; )
the burning of fossil fuels abnormally high levels of ozone
increases are produced
the nitric oxide so that abnormally high levels of ozone are produced