Resume - should I combine promotions at the same employer into one grouping?

I've always heard a resume should stay on one page, but to do that I need to combine the 2 promotions I got at my last employer into a single block. I don't want to be deceptive so I was going to list it as

"Officer / Manager / Analyst 2015 - 2018"

Is that wise, or should I actually break these into separate sections?

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