( ( The resonance ) ( ( ( ( causes ( the ( sound ( to ( be amplified ) ) ) ) ) and ) ( allows ( the ( call ( to ( carry further ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN resonance)) (VP (VP (VBZ causes) (NP (DT the) (NN sound) (S (VP (TO to) (VP (VB be) (VP (VBN amplified))))))) (CC and) (VP (VBZ allows) (NP (DT the) (NN call) (S (VP (TO to) (VP (VB carry) (RBR further))))))) (. .)))
The resonance causes the sound to be amplified and allows the call to carry further.
(ROOT (S (S (VP (VBN Amplified))) (, ,) (NP (PRP it)) (VP (VBZ becomes) (SBAR (S (NP (NNP louder)) (VP (VBZ happens) (VP (VB do) (NP (DT the) (NN sound)) (PP (IN during) (NP (DT a) (NN resonance)))))))) (. .)))