Original sentence: Pro-pedophile activism (also spelled pro-paedophile activism) is a a constellation of small fringe groups and individuals who want to legalize child sexual abuse and child pornography.They were most active from the 1950s to the early 1990s and is now maintained mostly through a few websites
Edited sentence: Pro-pedophile activism (also spelled pro-paedophile activism) is a small fringe movement that was most active from the 1950s to the early 1990s and is now maintained mostly through a few websites