( ( physical sciences ) ( such ( as ( ( ( ( ( physics , ) chemistry ) , ) and ) astronomy ) ) ) )
(ROOT (NP (NP (JJ physical) (NNS sciences)) (PP (JJ such) (IN as) (NP (NP (NNS physics)) (, ,) (NP (NN chemistry)) (, ,) (CC and) (NP (NN astronomy))))))
physical sciences such as physics, chemistry, and astronomy
(ROOT (S (NP (NP (NNP Chemistry)) (CC and) (NP (NNS physics))) (VP (VBP are) (NP (NP (NNS fields)) (PP (IN in) (NP (JJ physical))))) (. .)))