This is the 10236th most frequent Polish word.
będącym
"Being" or "who is."
The word 'będącym' acts as an adjectival participle describing 'Jan', indicating his state as a team member.
Jan, będącym członkiem zespołu, miał wiele obowiązków.
John, being a member of the team, had many responsibilities.
Here, 'będącym' functions to describe 'projekt', emphasizing its challenging nature.
Jest to projekt, będącym wielkim wyzwaniem dla wszystkich.
This is a project being a great challenge for everyone.
In this sentence, 'będącym' modifies 'człowiekiem', specifying the expertise as an attribute of the person.