One reason why it is hard to design and teach such courses is that they can cut across the insistence by top American universities that liberal-arts educations and professional education should be kept separate, taught in different schools. 

1.【翻译】设计和教授这类课程很难的一个原因是，这些课程可以绕过美国顶尖大学的要求，即文科教育和专业教育应该分开，在不同的学校里授课。

2. that liberal-arts educations and professional education should be kept separate, taught in different schools 是insistence 的同位语。说明其要求的具体内容。

3. taught in different schools 与 kept seperate，不是并列：

should be kept separate，（and）taught in different schools. 中间有and，说明是并列成分。没有and,  说明taught in different schools 是 should be kept separate 的结果状语。