The work is mainly to improve english,and translate improved

The work is mainly to improve english,and translate improved english into chinese.
The work is mainly to improve english,and translate improved english into chinese.
主要工作是提高英语,并且把改进后的英语翻译成中文.这是什么话呀?有点莫名其妙的,既然是英语干吗改进他?