( ( Connected ( by joints ) ) ( , ( ( the ( individual ( skeletal parts ) ) ) ( ( can ( be ( moved ( by ( the muscles ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBN Connected) (PP (IN by) (NP (NNS joints))))) (, ,) (NP (DT the) (JJ individual) (JJ skeletal) (NNS parts)) (VP (MD can) (VP (VB be) (VP (VBN moved) (PP (IN by) (NP (DT the) (NNS muscles)))))) (. .)))
Connected by joints, the individual skeletal parts can be moved by the muscles.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT the) (NN part)) (PP (IN of) (NP (NP (DT the) (JJ skeletal) (NN system)) (SBAR (WHNP (WDT that)) (S (VP (VBZ connects) (NP (NNS bones) (NNS joints))))))))) (. .)))