( Arachnids ( ( are ( arthropods ( that ( have ( ( 4 pairs ) ( of legs ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Arachnids)) (VP (VBP are) (NP (NP (NNS arthropods)) (SBAR (WHNP (WDT that)) (S (VP (VBP have) (NP (NP (CD 4) (NNS pairs)) (PP (IN of) (NP (NNS legs))))))))) (. .)))
Arachnids are arthropods that have 4 pairs of legs.
(ROOT (S (NP (NNS Arachnids)) (VP (VBP have) (NP (NP (CD 4) (NNS pairs)) (PP (IN of) (NP (NNS legs))))) (. .)))