[نبيل موريس جورج]

In the early 1980s, he was part of the team which did the first heart transplant.في الجملة دي لية الكاتب ما حطش a قبل كلمة part علي اعتبار انها اسم نكرة مفرد

A is usually dropped before part of if there is no adjective.
Part of the roof was missing. (B uT A large part of the roof was missing