the performances of the children , untrained in acting 
(ROOT (NP (NP (NP (DT the) (NNS performances)) (PP (IN of) (NP (DT the) (NNS children)))) (, ,) (ADJP (JJ untrained) (PP (IN in) (NP (NN acting))))))
(ROOT (NP (NP (NP (DT ) (NNS )) (PP (IN ) (NP (DT ) (NNS )))) (, ) (ADJP (JJ ) (PP (IN ) (NP (NN ))))))