Complex sentence: Opponents included Anti-ERA activists who believed that the ERA would destroy the family and morality One the most visible and vocal opponents of the ERA was Phyllis_Schlafly who started the STOP ERA campaign.
Split into simpler sentences: Opponents included Anti-ERA activists who believed that the ERA would destroy the family and morality. One of the most visible and vocal opponents of the ERA was Phyllis Schlafly, who started the STOP ERA campaign.