This is the 14334th most frequent Turkish word.
olduğundandı
"It was because of that."
In this sentence, 'olduğundandı' conveys the causation of the emotional state by specifying the contextual condition of being away.
Onun bu kadar üzgün olmasının sebebi annesinden uzak olduğundandı.
The reason for her being so sad was because she was away from her mother.
Here, 'olduğundandı' specifies the underlying reason for failing, emphasizing the condition of not having studied enough.
Başarısız olmalarının nedeni, yeterince çalışmamış olduklarındandı.
The reason for their failure was because they hadn't studied enough.
The expression 'olduğundandı' explains the condition that led to the specified lateness, which was the congestion in traffic.