我们有几个同事在会上提出了改进工作环境的合理建议。(sensible)

(1)In the meeting, several of my colleagues have come up with some sensile suggestions about how to improve working environment.

(2)In the meeting, some sensile suggestions about how to improve working conditions have been put forward by several of my colleages .

(3)In the meeting, some sensile suggestions about how to better working conditions were made by several of my colleages .

(4)In the meeting, some sensile suggestions about how improve working conditions should be improved /bettered was offered /afforded by several of my colleages .

我们有几个同事在会上提出了改进工作环境的合理建议。(sensible)

1. In the meeting, several[some] of my colleagues made some sensible suggestions on how to improve the working conditions.

  【参考】suggestions on how to improve ...关于如何改进......的建议（摘自《牛津英语搭配词典》第2版 suggestion）

2.In the meeting, several[some] of my colleagues put forward some sensible suggestions for the improvement of working environment.

  【参考】A comfortable working environment will increase productivity.舒适的工作环境能提高生产效率。（摘自《牛津英语搭配词典》第2版 environment）