Since some editors are not so good as others, authors must make every effort to make the manuscript as consistent and as nearly perfect as can be. If an error in print reproduces and error in the manuscript, the author has no one to blame but himself. It must prove necessary or be eliminated. In this sentence it is not necessary. Any editor can save.
Good ones do.
However, the most important thing we can do with any sentence is to improve its verb. Verbs with auxiliaries are, in general, weaker that verbs without auxiliaries. The second sentence is horrid. A good editor would not correct anything except errors. Clearly this sentence would be improved if we could incorporate the sense of this abstract noun into the verb.