<p>He has become a successful (painter specializing in, landscapes of exotic places) rendered in vivid colors.</p>
<p>1) no change
2) painter specializing in landscapes of exotic places
3) painter, specializing in, landscapes of exotic places
4) painter specializing in landscapes, of exotic places, </p>
<p>The correct answer is A. </p>
<p>Can you please explain what grammar rule this follows? </p>