( ( He ( ( is not ) ( ( an ( impersonal force ) ) ( like ( ( magnetism or ) gravity ) ) ) ) ) ( , ( he ( ( is ( a ( real person ) ) ) . ) ) ) )
(ROOT (S (S (NP (PRP He)) (VP (VBZ is) (RB not) (NP (NP (DT an) (JJ impersonal) (NN force)) (PP (IN like) (NP (NN magnetism) (CC or) (NN gravity)))))) (, ,) (NP (PRP he)) (VP (VBZ is) (NP (DT a) (JJ real) (NN person))) (. .)))
He is not an impersonal force like magnetism or gravity, he is a real person.
(ROOT (S (NP (NNP Gravity) (CC and) (NNP magnetism)) (VP (VBP are) (NP (DT both) (JJ common) (NNS forces))) (. .)))
Gravity and magnetism are both common forces.