He solved the problem as one might have expected.
He solved the problem, as one might have expected.
As far as I know, the first adverbial clause tells us how he solved the problem.
But I don't see a difference in meaning the insertion of a comma after problem would create.
(1) He solved the problem, as one might have expected. He solved the problem. We expected him to solve it.
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(1) He solved the problem, as one might have expected. He solved the problem. We expected him to solve it.
Broadly speaking, a comma in writing represent a pause in speaking. In #1, if you pause after problem, it sounds like what you have just said is the main point you wish to convey to the listener, and what follows is an afterthought.
(2) He solved the pro
anonymousHe solved the problem as one might have expected.
He solved the problem in a certain way: He solved it by using the very method that anyone would have predicted he would use.
anonymousHe solved the problem, as one might have expected.
He solved the problem, which is exactly what anyone would have predicted