( ( ( ( ( ( The dermis ) ( lies ( below ( the epidermis ) ) ) ) , ) and ) ( ( these ( two layers ) ) ( ( are collectively ) ( known ( as ( the skin ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NNS dermis)) (VP (VBZ lies) (PP (IN below) (NP (DT the) (NNS epidermis))))) (, ,) (CC and) (S (NP (DT these) (CD two) (NNS layers)) (VP (VBP are) (ADVP (RB collectively)) (VP (VBN known) (PP (IN as) (NP (DT the) (NN skin)))))) (. .)))
The dermis lies below the epidermis, and these two layers are collectively known as the skin.
(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)))))) (. .)))