_

... on the other hand, a heart doctor who knows absolutely nothing about golf might find such a report puzzling and difficult to understand.however, aheart doctor who knows all there is to know about heart disease would easily be able to read and understand the writings of other heart doctors on the subject.

두번째 문장... 문장 구조를 파악하려니 좀 이상해서요 .....
접속사 however, 뒤에 주어가 나온 것 같은데 또 all 뒤에 there is가 나오구.....
이 문장... 전체적으로 차근차근 친절한 설명꼭 좀 부탁드립니다.. ^^