Crombell Production is widely known for utilizing promotional billboards while retailing product lines of which sales have been satisfying to some degree.



while은 부사절접속사라 뒤에 주어 동사로 이루어진 문장이 와야되는걸로 알고있는데용



위에꺼는 product line을 받아줄 동사가 없지않나요?