Complex sentence: There are no current wheat cultivars on the market with good resistance to common bunt, but there are research efforts that are utilizing a resistant cultivar of wheat (known as McKenzie) to determine through DNA marking the locations on the DNA where McKenzie acquires its resistance.
Split into simpler sentences: There are no current wheat cultivars on the market with good resistance to common bunt. There have been research efforts that utilized a resistant cultivar of wheat (known as McKenzie) to determine through DNA marking the locations on the DNA where McKenzie acquires its resistance.