Original sentence: People known to use Wikipedia as a reference source include film critic Roger Ebert, comedian Rosie O'Donnell and University of Maryland physicist Robert L.Sheizaf Rafaeli and Yaron Ariel report how "most people agree that at least the English version of Wikipedia is approaching critical mass where substantial content disasters should become rare
Edited sentence: But in practice it does, in part because of the social and psychological structures that motivate participants on both content and maintenance tasks.Seemingly, and "in theory", an unsupervised mass collective effort should not work well.Sheizaf Rafaeli and Yaron Ariel report how "most people agree that at least the English version of Wikipedia is approaching critical mass.where substantial content disasters should become rare