你的句子还是不错的。我稍微改了一下：

During their university life, it is useful for them to join in colorful activities and develop their individual characters and abilities, such as doing a part-time job, working as a volunteer or a trainee, and so on.

【翻译】在他们大学生活期间，参加丰富多彩的活动，发展个性和能力，如做兼职工作，当志愿者或实习生等等，这都是非常有用的。