zhè / suǒ / dà / xué / shí / xíng / nán / nǚ / tóng / xiào / yǐ / jīng / yǒu / wǔ / shí / nián / de / lì / shǐ / le

这所大学实行男女同校，已经有五十年的历史了。

This university has practiced coeducation for fifty years.