Before revision:  Story generation slowed dramatically during the  major waves of the COVID-19 pandemic in 2020 , with rapid turnover returning first with the Black Lives Matter protests following URLe Floyd's murder and then later by events leading up to and following the presidential election.
After revision:  Story generation slowed dramatically during the first two major waves of the COVID-19 pandemic in 2020 , with rapid turnover returning first with the Black Lives Matter protests following URLe Floyd's murder and then later by events leading up to and following the presidential election.