This is the 6125th most frequent Turkish word.
yöneticilerinden
"From its/their managers" or "from its/their administrators."
It indicates possession, specifying one person among the managers of the referenced company.
Bu şirketin yöneticilerinden biri toplantıya katıldı.
One of the managers of this company attended the meeting.
The context refers to identifying any individual from among the administrators belonging to the school.
Okulun yöneticilerinden herhangi biriyle görüşebilir misin?
Can you talk to any of the administrators of the school?
The reference here is to managers of a group, indicating association or belonging.