This is the 18440th most frequent Korean word.
시니어타운을
"Senior town" or "a residential area for seniors."
Here, '시니어타운을' functions as the object of the verb '방문하였습니다', indicating the town being visited.
시니어타운을 방문하였습니다.
I visited the senior town.
In this case, '시니어타운을' is part of the phrase indicating for whom the funds are gathered.
시니어타운을 위한 기금을 모았습니다.
I gathered funds for the senior town.
Here, '시니어타운을' acts as the object of the verb '개선하기로', stating specifically the thing that is to be improved.