Original sentence: A leading proponent of the "green" school since 1994 is Stevan Harnad
Edited sentence: A sole proponent and idealogue of the "green" school since 1994 is Stevan Harnad.Open Access publishing, where the author (or a third-party acting on his/her behalf) pays to publish, has been proposed as an alternative to a subscription-based revenue model.Unfortunately, its success has been rather limited