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Ever since his wife left him, he’s had a drink problem.

(macmillandictionary.com )

Is Ever since his wife left him a preposition phrase in Ever since his wife left him, he’s had a drink problem?

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I think it is.

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anonymousIs Ever since his wife left him a preposition phrase in Ever since his wife left him, he’s had a drink problem?

In modern grammar I believe it is (without the initial "ever").

The "ever" looks like an adverb/adjunct to me, but in your place I'd wait for BillJ to weigh in on this.

CJ