Complex sentence: Following his conviction, Mensch called for networking sites to identify anonymous bullies saying it was impossible for the victim to ascertain the seriousness of the threat posed, while the bullies felt they could do as they pleased without fear of retribution.
Split into simpler sentences: Following his conviction, Mensch called for networking sites to identify anonymous bullies saying it was impossible for the victim to ascertain the seriousness of the threat posed. Meanwhile the trolls felt they could do as they pleased without fear of retribution.