Complex sentence: Based on microsatellite tests, of the four Basque horse breeds, the pottok and the Basque Mountain Horse are genetically the most distant from other breeds, the Aurikzo and the Navarrese Horse (two meat breeds) less so.
Split into simpler sentences: Based on microsatellite tests, of the four Basque horse breeds, the Pottok and the Basque Mountain Horse, are genetically the most distant from other breeds. The others, the Aurikzo and the Navarrese horse (today considered meat breeds) less so.