Original sentence: The group Americans for Prosperity was formed as a successor to Citizens for a Sound Economy.The groups overlap significantly, sharing members, directors, missions, and mailing addresses.Wayne Gable is both a member of the board of directors of Americans for Prosperity, and the managing director of the lobbying organization of Koch Industries
Edited sentence: Although the groups are nominally separate, they share numerous members, directors, missions, and even addresses.The group Americans for Prosperity currently acts as the political arm of the company, formed as a successor to Citizens for a Sound Economy.Wayne Gable, for instance, is a member of the board of directors of Americans for Prosperity, and is simultaneously the managing director of the lobbying wing of Koch Industries