( Coal ( ( is ( one ( of ( the ( primary ( energy sources ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (DT the) (JJ primary) (NN energy) (NNS sources))))) (. .)))
Coal is one of the primary energy sources.
(ROOT (S (S (NP (NNP Coal)) (VP (VBZ is) (ADJP (JJ nonrenewable)))) (, ,) (CC and) (S (NP (DT the) (NN sun)) (VP (VBZ is) (ADJP (JJ renewable) (SBAR (S (VP (VBZ is) (SBAR (WHADVP (WRB how)) (S (NP (NP (NN coal)) (CC and) (NP (DT the) (NN sun))) (VP (VBP compare) (PP (IN as) (NP (NP (NNS sources)) (PP (IN of) (NP (NN energy)))))))))))))) (. .)))