Original sentence: At a workshop held in 2000 at Manlius Pebble Hill School in DeWitt, NY, Kohn lectured for two hours about the problems with using this approach to teach elementary and secondary school students.He devoted another hour to a question-and-answer session, taking three questions during this period and giving twenty minute answers to each question.Kohn is a vocal critic of lecturing of school children, supporting 'active learing' instead
Edited sentence: - Kohn is a vocal critic of lecturing, supporting 'active learing' instead.He devoted another hour to a question-and-answer session but only took three questions during this period, giving twenty minute answers to each question.Nevertheless, at a workshop held in 2000 at Manlius Pebble Hill School in DeWitt, NY, Kohn himself lectured for two hours about the problems with this approach