All are byproducts of burning oil, coal, and natural gas to generate electricity, and each of those sources of energy produces varying amounts of each substance.
(All; are; byproducts of burning oil, coal, and natural gas) (each of those sources of energy; produces; varying amounts of each substance)
All each of those sources of energy
are produces
byproducts of burning oil, coal, and natural gas
varying amounts of each substance