Complex sentence: Dudley W. Brown (born 1965) is a pro-gun lobbyist, the founder and executive director of Rocky Mountain Gun Owners, a organization based in Denver, Colorado that bills itself as a "no-compromise" pro-gun Second Amendment group.
Split into simpler sentences: Dudley W. Brown (born 1965) is a pro-gun lobbyist, as well as the founder and executive director of Rocky Mountain Gun Owners based in Denver, Colorado. Brown's organization bills itself as a "no-compromise" pro-gun Second Amendment group.