This is the 1970th most frequent Turkish word.
oluşturduğu
"That which is created/formed by (him/her/it)."
In this sentence, 'oluşturduğu' modifies 'deneyimlerin' (the experiences), meaning 'formed/created by the artist'. It is in a relative clause expressing an action performed by the subject 'sanatçı' (the artist).
Bu eser, sanatçının uzun yıllar boyunca oluşturduğu deneyimlerin bir ürünüdür.
This work is a product of the experiences the artist has built over many years.
Here, 'oluşturduğu' refers to 'dayanışma' (solidarity), indicating that society is the entity that creates the solidarity among individuals. It forms a relative clause describing the relationship between the subject society and the solidarity.
Toplumun bireyler arasında oluşturduğu dayanışma, sosyal bağları güçlendirir.
The solidarity created by the society among individuals strengthens social bonds.
In this example, 'oluşturduğu' relates to 'tarihsel birikim' (historical accumulation), showing how the past has formed or created this accumulation. The clause specifies the subject performing the forming action, here 'the past'.