Is 'One gets the impression that the editors of L used the good stuff from the W and substituted their own, much better material when they encountered some of the bad stuff.' an autonomous statement, not logically connected to 'The editors appeared to have subsitited nothing when working on W. '
One gets the impression that the editors of L used the good stuff from the W and substituted their own, much better material when they encountered some of the bad stuff.###The editors appeared to have subsitited nothing when working on W. 