Through repetition of the task and coaching by experts, the operator would become very productive.
( ( Through ( repetition ( of ( ( the ( ( task and ) coaching ) ) ( by experts ) ) ) ) ) ( , ( ( the operator ) ( ( would ( become ( very productive ) ) ) . ) ) ) )
(ROOT (S (PP (IN Through) (NP (NP (NN repetition)) (PP (IN of) (NP (NP (DT the) (NN task) (CC and) (NN coaching)) (PP (IN by) (NP (NNS experts))))))) (, ,) (NP (DT the) (NN operator)) (VP (MD would) (VP (VB become) (ADJP (RB very) (JJ productive)))) (. .)))
The operator would become productive only by studying written guides.
( ( The operator ) ( ( would ( ( become productive ) ( only ( by ( studying ( written guides ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN operator)) (VP (MD would) (VP (VB become) (ADJP (JJ productive)) (PP (RB only) (IN by) (S (VP (VBG studying) (NP (VBN written) (NNS guides))))))) (. .)))