The pieces are unloaded and fed into sorting machines.
( ( The pieces ) ( ( are ( ( ( unloaded and ) fed ) ( into ( sorting machines ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS pieces)) (VP (VBP are) (VP (VBN unloaded) (CC and) (VBN fed) (PP (IN into) (NP (VBG sorting) (NNS machines))))) (. .)))
Sorting machines help a lot 
( Sorting ( machines ( help ( a lot ) ) ) )
(ROOT (S (VP (VBG Sorting) (S (NP (NNS machines)) (VP (VB help) (NP (DT a) (NN lot)))))))