Getting a leak through a window sill and I'm not sure on how to fix it; what are the next steps I can take here?

I'm trying to gauge whether or not it's worth hiring a professional for this. I purchased a home recently and, as you can see in the attached photos, there is a leak from the sill going down the wall that's causing damage. I'm not much of a handyman but I can follow instructions decently, so I just wanted to know if there's an easy fix here for the leak that I can apply. Thank you in advance for the help. via /r/DIY


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