That seems to be an unusual sentence construction, but yes the writer is trying to show simultaneous actions. Generally, these would be actions that are not commonly connected. Dave steered the speeding vehicle and while at it, tried to revive the unconscious cat.
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AnonymousIs 'while at it' used to show that the simultaneity of both actions?Yes. It's casual English and, to me, doesn't seem terribly comfortable in your example sentence. More common are uses like "I'll wash the car and, while I'm at it, I'll get rid of all that junk in the boot." Similarly, "while you're/he's/etc. at it".
AnonymousIs there another way to convey the same thing without using 'while at it'? I find it a little awkward.You can say: