( ( ( The skeleton ) , ) ( ( bones and ) joints ) )
(ROOT (NP (NP (DT The) (NN skeleton)) (, ,) (NP (NNS bones) (CC and) (NNS joints))))
The skeleton, bones and joints
(ROOT (S (NP (NNS Joints)) (VP (VBP are) (NP (NP (DT the) (NN location)) (SBAR (WHADVP (WRB where)) (S (NP (NNS bones)) (VP (VBP come) (ADVP (RB together))))))) (. .)))
Joints are the location where bones come together.