Question about the origins of English?

As I understand it, English evolved from Latin as did Spanish, Italian, Portuguese, etc. I hear similarities between Spanish, Italian, and Portuguese, and Latin...but not English. Also, English 500 years ago sounds nearly identical to todays, but a few hundred years before that Latin was used which sounds very... show more As I understand it, English evolved from Latin as did Spanish, Italian, Portuguese, etc. I hear similarities between Spanish, Italian, and Portuguese, and Latin...but not English. Also, English 500 years ago sounds nearly identical to todays, but a few hundred years before that Latin was used which sounds very little like English.

I guess my question is, how did English make such a dramatic departure from Latin so quickly?
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