a brief consideration of its major subject areas will further clarity 【how the study of pharmacology is best approached （from the standpoint of the specific requirements and interests of the medical student and practitioner）】
【】中为clarify的宾语从句.宾语从句意为：从具体要求和医学生、实习者的兴趣来看,药理学的学习怎么最好地达到效果.
a brief consideration of its major subject areas will further clarify 对它（药理学）的专业学科领域短暂的考虑将更加清楚的地解释.
不懂追问~