This is the 14307th most frequent Turkish word.
okuyunca
"Okuyunca" means "when/after reading" in English.
Here, 'okuyunca' represents a temporal clause indicating that the action of reading the book caused the speaker to be affected.
Kitabı okuyunca çok etkilendim.
I was very affected after reading the book.
In this context, 'okuyunca' establishes a cause-effect relationship, where reading the article triggered the memory of the past.
O yazıyı okuyunca geçmişi hatırladım.
When I read that article, I remembered the past.
The usage of 'okuyunca' in this sentence expresses that the act of reading the poem was followed by the feeling of being emotional.