However, there are four drawbacks in the dataset of <cite>Kajiwara and Yamamoto (2015)</cite> : (1) <cite>they</cite> extracted sentences only from a newswire corpus; (2) <cite>they</cite> substituted only a single target word; (3) <cite>they</cite> did not allow ties; and (4) <cite>they</cite> did not integrate simplification ranking considering the quality. Hence, we propose a new dataset addressing the problems in <cite>the dataset</cite> of <cite>Kajiwara and Yamamoto (2015)</cite> .