( ( This arm ) ( ( ( ( ( senses ( ( the movements ) ( of ( her ( elbow muscles ) ) ) ) ) ( to ( ( ( open and ) close ) ( its fingers ) ) ) ) , ) ( allowing ( Alicia ( to ( ( pick up ) things ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN arm)) (VP (VBD senses) (NP (NP (DT the) (NNS movements)) (PP (IN of) (NP (PRP$ her) (NN elbow) (NNS muscles)))) (S (VP (TO to) (VP (VB open) (CC and) (VB close) (NP (PRP$ its) (NNS fingers))))) (, ,) (S (VP (VBG allowing) (S (NP (NNP Alicia)) (VP (TO to) (VP (VB pick) (PRT (RP up)) (NP (NNS things)))))))) (. .)))
This arm senses the movements of her elbow muscles to open and close its fingers, allowing Alicia to pick up things.
(ROOT (S (NP (JJ Intrinsic) (NNS muscles)) (VP (VBP allow) (NP (PRP$ your) (NNS fingers)) (S (VP (TO to) (VP (ADVP (RB also)) (VB make) (NP (NP (JJ precise) (NNS movements)) (PP (IN for) (NP (NNS actions)))))))) (. .)))