( Mylar ( ( is ( ( a ( trade name ) ) ( for ( a ( ( transparent ( , colourless ) ) ( polyester ( ( sheet or ) film ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mylar)) (VP (VBZ is) (NP (NP (DT a) (NN trade) (NN name)) (PP (IN for) (NP (DT a) (ADJP (JJ transparent) (, ,) (JJ colourless)) (NN polyester) (NN sheet) (CC or) (NN film))))) (. .)))
Mylar is a trade name for a transparent, colourless polyester sheet or film.
(ROOT (S (NP (NP (DT The) (NN name)) (PP (IN of) (NP (NP (NN film)) (SBAR (IN that) (S (NP (NN polyester) (NNS fibers)) (VP (VBP form))))))) (VP (VBZ is) (ADJP (JJ mylar))) (. .)))