4 million homes watch the evening news on CBS, ABC, and NBC.
( ( ( 4 million ) homes ) ( ( watch ( ( the ( evening news ) ) ( on ( CBS ( , ( ABC ( , ( and NBC ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (QP (CD 4) (CD million)) (NNS homes)) (VP (VBP watch) (NP (NP (DT the) (NN evening) (NN news)) (PP (IN on) (NP (NNP CBS) (, ,) (NNP ABC) (, ,) (CC and) (NNP NBC))))) (. .)))
4 million homes watch CBS, ABC and NBC. 
( ( ( 4 million ) homes ) ( ( watch ( CBS ( , ( ( ABC and ) NBC ) ) ) ) . ) )
(ROOT (S (NP (QP (CD 4) (CD million)) (NNS homes)) (VP (VBP watch) (NP (NNP CBS) (, ,) (NNP ABC) (CC and) (NNP NBC))) (. .)))