( ( This ( monocrystalline structure ) ) ( ( ( ( is ( very strong ) ) and ) ( ( produces ( an improvement ) ) ( like ( ( the difference ) ( between ( ( ( a ( brittle ( pencil lead ) ) ) and ) ( a ( carbon-fibre ( tennis racket ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (JJ monocrystalline) (NN structure)) (VP (VP (VBZ is) (ADJP (RB very) (JJ strong))) (CC and) (VP (VBZ produces) (NP (DT an) (NN improvement)) (PP (IN like) (NP (NP (DT the) (NN difference)) (PP (IN between) (NP (NP (DT a) (JJ brittle) (NN pencil) (NN lead)) (CC and) (NP (DT a) (JJ carbon-fibre) (NN tennis) (NN racket)))))))) (. .)))
This monocrystalline structure is very strong and produces an improvement like the difference between a brittle pencil lead and a carbon-fibre tennis racket.
(ROOT (S (SBAR (IN Although) (S (NP (PRP they)) (VP (VBP differ) (ADVP (RB vastly)) (PP (IN in) (NP (NNS hardness)))))) (, ,) (NP (NP (NN pencil) (NN lead)) (CC and) (NP (NNS diamonds))) (DT both) (VP (VBP contain) (NP (NN carbon))) (. .)))