Please try to arrange for more staff to take part in the training as much as possible.arrange for sb. to do sth. 安排某人做某事，固定搭配as much as possible 尽可能 希望可以帮到您。
正式的邮件中不要用缩略词 don't要写成 do not.如果是免费午餐,建议说明。如：There will be a free lunch for you tomorrow.If you do not need lunch ,please contact me with e-mial before 9:30a.m. 5th June.2017.Look forward to your arrival。整体语法还行，就是有点Chinglish建议再写英文时可以参考下谷歌翻译的翻译结果。
