My oldest son started getting aggressive – he hits his little brother and throws his toys around, but what is much more worrisome, he is starting to exhibit signs of self-harm.
Without the underlined "what is", as this one below, would it still sound natural?
My oldest son started getting aggressive – he hits his little brother and throws his toys around, but much more worrisome, he is starting to exhibit signs of self-harm.
You can leave out 'what is', but you must change 'worrisome' to 'worrisome ly ''. though I prefer 'worryingly'.
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You can leave out 'what is', but you must change 'worrisome' to 'worrisomely''. though I prefer 'worryingly'.