This is the 11770th most frequent Turkish word.
geliyordur
"Geliyordur" means "He/She/It is probably coming" in English, indicating a conjecture or probability.
In this sentence, 'geliyordur' is used to express a probable current state of the action of coming from a specific route.
O sıradan geliyordur.
He/She might be coming from his/her routine route.
Here, 'geliyordur' conveys an assumed action of the subject coming to the home.
Eve geliyordur diye düşündüm.
I thought he/she might be coming home.
In this usage, 'geliyordur' indicates the likely ongoing process of the subject coming towards the school.