Problem: If "Of one thing Mark was sure. Harry knew much less than he did.", is "Harry knew much less than Harry did." correct?

Answer: no

Problem: If "The Wainwrights treated Mr. Crowley like a prince until he made his will in their favor; then they treated him like dirt. Folks said he died just to be rid of their everlasting nagging.", is "Folks said he died just to be ride of the folks' everlasting nagging." correct?

Answer: no

Problem: If "This book introduced Shakespeare to Goethe; it was a fine selection of his writing.", is "It was a fine selection of Goethe's writing." correct?

Answer:
no