杰克说学英语最好的方法是多看看英语电影和英语报纸这样能更好的帮助你的表达能力 英语翻译

Jack said that the best way to learn English was to watch English movies and to read English newspapers,because it could improve you skill at expressing.

…………because it could improve your expression skills.

jack said that the best way to learn english was to watch english movies and read english papers so that you can improve your expression skills better.

PS:paper在英文里就是报纸的意思，而因为有and的连接，所以只需要一个to就OK了，expression才是express的名词形式，不是expressing，那是现在进行时。