The Sarbanes-Oxley provisions were based in large part on GAO's new independence standards.
Part of Sarbanes-Oxley was based on the new independence standards of the GAO. 
mnli hypothesis: Part of Sarbanes-Oxley was based on the new independence standards of the GAO.  premise: The Sarbanes-Oxley provisions were based in large part on GAO's new independence standards.