Original sentence: However, it is not clear how often libraries actually do restrict access to the books, and there have been several high-profile failures to do so.In the United States, the series was seventh on the list of books that were most challenged in American libraries between 1900 and 2000 despite having been first published in the United States in 1997.The series has been frequently challenged for alleged inappropriate content
Edited sentence: However, it's not clear how often libraries actually do ban or restrict the book, and there have been several high-profile failures to do so.In the United States, the series was 7th on the list of books which were most requested to be banned in libraries between 1900 and 2000 despite having been first published in the United States in 1997.The series has been a frequent target of banning and censorship