If the mountain ranges had stood along the southern and

eastern shores of England instead of standing far back to

west and north,

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the tribal invasion of the island from the continent

( would have been ) so arduous a task that Britain would

not have become the early receptacle for so many

different races of vigorous barbarians.점선 밑에서부터 해석이 이상해집니다....
괄호안은 저게 맞다고 생각하고 ㅎ

문장이 너무 길어서 죄송하지만... 부탁드립니다