an important point to grasp, and one that has particular relevance for anyone attempting to understand the perceptual aspects of driving, is that the purpose of visual perception is not to transmit an image from the eye to the brain, or to cleanwbr / ~

여기서 주어가 an important point to grasp인것은 알고 있는데, 뒤에 and 때문에 주어가 두개가 아니냐고 하는 분들도 있어서요. 정확히 and 절 쪽을 설명해주고 싶은데 문법적으로 주어가 단수인 이유는 무엇인가요?