( ( ( ( Electrostatic precipitators ) and ) sulfur ) ( ( trioxide conditioning ) . ) )
(ROOT (S (NP (NP (JJ Electrostatic) (NNS precipitators)) (CC and) (NP (NN sulfur))) (VP (VBP trioxide) (NP (NN conditioning))) (. .)))
Electrostatic precipitators and sulfur trioxide conditioning.
(ROOT (S (NP (NNP Sulfur)) (VP (MD can) (VP (VB combine) (PP (IN with) (NP (NN oxygen))) (S (VP (TO to) (VP (VB produce) (NP (NN sulfur) (NN trioxide))))))) (. .)))