And the meaning of "We have made easy (yassarna)" is: We have made simple. It has been narrated that the scriptures of the people of religions, such as the Torah,
Arabic (Source)
وَمعنى ﴿يَسَّرْنَا﴾ أَي: سهلنا، وَرُوِيَ أَن كتب أهل الْأَدْيَان نَحْو التَّوْرَاة