Original sentence: Several recent DNA studies strongly suggest that most Ashkenazi Y-Chromosome Jews originated in Middle Eastern populations, as has the mitochondrial DNA (mtDNA) of at least 40% of the current Ashkenazi population
Edited sentence: Recent DNA studies demonstrate that Ashkenazi Y-Chromosome Jews originated in Middle Eastern populations, as has the mitochondrial DNA (mtDNA) of at least 40% of the current Ashkenazi population