( ( Describing ( the work ) ) ( ( involves ( ( not only ) ( ( ( ( good writing ) , ) ( but also ) ) ( ( a ( solid structure ) ) ( that ( helps ( ( the reader ) ( follow ( the explanation ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (S (VP (VBG Describing) (NP (DT the) (NN work)))) (VP (VBZ involves) (NP (CONJP (RB not) (JJ only)) (NP (JJ good) (NN writing)) (, ,) (CONJP (CC but) (RB also)) (NP (NP (DT a) (JJ solid) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ helps) (S (NP (DT the) (NN reader)) (VP (VB follow) (NP (DT the) (NN explanation)))))))))) (. .)))
Describing the work involves not only good writing, but also a solid structure that helps the reader follow the explanation.
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ solid) (JJ natural) (NN material)) (PP (IN with) (NP (DT a) (NN crystal) (NN structure))))))) (. .)))