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))))) (. .)))
They were unloaded but not sorted
( They ( were ( ( unloaded ( but not ) ) sorted ) ) )
(ROOT (S (NP (PRP They)) (VP (VBD were) (VP (VBN unloaded) (CONJP (CC but) (RB not)) (VBN sorted)))))