( ( ( The dermis ) ( which ( ( is considerably ) thicker ) ) ) ( , ( ( contains ( most ( of ( ( the ( important structures ) ) ( of ( the skin ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (NNS dermis)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB considerably)) (NP (JJR thicker)))))) (, ,) (VP (VBZ contains) (NP (NP (JJS most)) (PP (IN of) (NP (NP (DT the) (JJ important) (NNS structures)) (PP (IN of) (NP (DT the) (NN skin))))))) (. .)))
The dermis which is considerably thicker, contains most of the important structures of the skin.
(ROOT (S (NP (DT The) (NNS dermis)) (VP (VBZ contains) (NP (NP (JJS most)) (PP (IN of) (NP (NP (DT the) (NNS structures)) (VP (VBN found) (PP (IN in) (NP (NN skin)))))))) (. .)))