Complex sentence: As Family First leader, he has been involved in campaigns against legislation that abolished the parental right to corporal punishment in New Zealand under the Crimes Act 1961, and his organisation successfully advocated for non-binding referenda in New Zealand over the issue.
Split into simpler sentences: As Family First leader, he has been involved in campaigns against the legislative change that removed the justification of corporal punishment by parents in New Zealand; under the Crimes Act 1961. His organisation successfully advocated for non-binding referenda in New Zealand over the issue.