( Skin ( ( is ( made ( of ( ( two layers ) ( of ( ( specialized cells ) ( called ( ( the epidermis ) ( which ( is ( ( ( the ( outer layer ) ) and ) ( ( the dermis ) ( which ( is ( the ( inner layer ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Skin)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (NP (CD two) (NNS layers)) (PP (IN of) (NP (NP (JJ specialized) (NNS cells)) (VP (VBN called) (NP (NP (DT the) (NNS epidermis)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT the) (JJ outer) (NN layer)) (CC and) (NP (NP (DT the) (NNS dermis)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (DT the) (JJ inner) (NN layer)))))))))))))))))) (. .)))
Skin is made of two layers of specialized cells called the epidermis which is the outer layer and the dermis which is the inner layer.
(ROOT (S (NP (DT The) (NN skin)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (NP (CD two) (NNS layers)) (: :) (NP (NNS epidermis) (CC and) (NNS dermis)))))) (. .)))