Complex sentence: This was set up to help to eliminate dishonest seed suppliers selling one seed as another, and to keep any one variety true, and thus there were stringent tests to assess varieties to ensure they remain the same from one generation to the next.
Split into simpler sentences: This was set up to help in eliminating dishonest seed suppliers selling one seed as another, and to keep any one variety true. Thus there were stringent tests to assess varieties, with a view to ensuring they remain the same from one generation to the next.