This is the 12978th most frequent Turkish word.
kalmasından
"Kalmasından" means "from (his/her/its) staying" or "due to (his/her/its) staying."
In this sentence, 'kalmasından' is derived from the verb 'kalmak' (to stay), adding the suffix '-masından' to indicate the reason or situation that is appreciated or commented on.
Eve dönmeseniz bile burada kalmasından memnun oluruz.
Even if you don’t return home, we would be pleased that they stayed here.
Here, 'kalmasından' emphasizes the condition of remaining in a consistent or successful state, linked with the preceding action.
Onun bu projede görev alıp başarılı kalmasından oldukça etkileniyorum.
I am greatly impressed by their ability to take a role in this project and remain successful.
In this usage, 'kalmasından' conveys necessity or inevitability regarding the state of staying away given the described conditions.