( ( ( ( Insects ( have ( three pairs ) ) ) and ) ( arachnids ( have ( ( four pairs ) ( of limbs ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Insects)) (VP (VBP have) (NP (CD three) (NNS pairs)))) (CC and) (S (NP (NNS arachnids)) (VP (VBP have) (NP (NP (CD four) (NNS pairs)) (PP (IN of) (NP (NNS limbs)))))) (. .)))
Insects have three pairs and arachnids have four pairs of limbs.
(ROOT (S (NP (NNP Birds)) (VP (VBP have) (NP (CD four) (NNS limbs))) (. .)))