Complex sentence: Members of the private initiative in Mexico said that in order to eliminate NAFTA there are a lot of laws that have to be adapted by the U.S. Congress and this will also eventually result in legal complaints by the World Trade Organization.
Split into simpler sentences: Members of the private initiative in Mexico said that in order to eliminate NAFTA many laws must be adapted by the U.S. Congress. It will also eventually result in legal complaints by the World Trade Organization.