@Tes yeux noirs,
Thank you very much for your quick response! I really appreciate it.
I understand what you kindly point out.
Can I ask additional question please?
Most of my Japanese friends say "maintained professional appearance" is modifier for "staff" but I don't think so.
I think Staff is subject and maintained is verb and the subject and object are followed by the "that-clause". (that is omitted this case)
Am I correct??
Sorry for my poor English to explain.