This is the 13643rd most frequent Turkish word.
kuruluşlarından
"From their establishments" or "from their organizations."
The word 'kuruluşlarından' here refers to the establishments belonging to a group, indicated by the possessive '-larından' which in this sentence connects 'kuruluş' (establishment) with 'birçok' (many).
Bu şehirde birçok kuruluşlarından hizmet alabildik.
In this city, we were able to receive services from many of their establishments.
In this sentence, 'kuruluşlarından' indicates possession, referring to one specific organization among many belonging to them ('onların' - their).
Onların kuruluşlarından biri bu sektörde oldukça başarılı.
One of their organizations is quite successful in this sector.
Here, 'kuruluşlarından' refers to the organizations that the association members belong to, using the possessive suffix '-larından' for association and origin.