Why did Allah Almighty make lawful for Muslim men to have sexual intercourse with the married women from the?

this is a misunderstood practice. It was allowed when islam became the law and they were already engaged in it. "Those of whom your right hand possessed" is similar to the islamic prohibition to marry sisters or mother and daughter at the same time but when it was already married, then , so be it. But after islam was imposed, it is not allowed. Even with the captives of war, there should be mutual agreement and a marriage be conducted before they can engage in sex. You provided the verse.