But technical innovations have aided the operators.
( But ( ( technical innovations ) ( ( have ( aided ( the operators ) ) ) . ) ) )
(ROOT (S (CC But) (NP (JJ technical) (NNS innovations)) (VP (VBP have) (VP (VBN aided) (NP (DT the) (NNS operators)))) (. .)))
Unfortunately operators haven't been aided by technical innovation.
( Unfortunately ( operators ( ( ( have n't ) ( been ( aided ( by ( technical innovation ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Unfortunately)) (NP (NNS operators)) (VP (VBP have) (RB n't) (VP (VBN been) (VP (VBN aided) (PP (IN by) (NP (JJ technical) (NN innovation)))))) (. .)))