Complex sentence: Perhaps the most significant difference is that psychiatrists are licensed physicians, and, as such, psychiatrists are apt to use the medical model to assess mental health problems and to rely on psychotropic medications as a method of addressing mental health problems.
Split into simpler sentences: Perhaps the most significant difference is that psychiatrists are licensed physicians. As such, psychiatrists often use the medical model to assess mental health problems and rely on psychotropic medications as the chief method of addressing mental health problems.