Today, professors routinely treat the progressive interpretation of history and progressive public policy as the proper subject of study while portraying conservative or classical liberal ideas — such as free markets and self-reliance — as falling outside the boundaries of routine, and sometimes legitimate, intellectual investigation.（Text 4. 2014. 英一）
1、谓语动词
treat
2、主语
professors
3、主干
professors routinely treat the progressive interpretation of history and progressive public policy as the proper subject of study.
4、补充
本句的主干可拆分为professors treat A as B (认为A是B) / while (表对比) / portray C as D (认为C是D)。这样就容易理解了
5、翻译
现如今，教授们通常把对历史的革新性解读和主张改革的公共政策视为合适的研究课题，而把传统或古典的人文思想——如自由市场和自力更生——描述为超出常规，有时甚至认为超出了正当的学术研究范畴。