求助一个39+3上面的长难句

xxiang13

求助分析一下这个长难句，看的我都晕了，谢谢！
In the early 1950's, historians who studied preindustrial Europe which we may define here as Europe in the period form roughly 1300 to 1800 began, for the first time in large numbers, to investigate more of the preindustrial European population than the 2 or 3 percent who comprised the political and social elite: the kings, generals, judges, nobles, bishops, and local magnates who had hitherto usually filled history books.

竹林中人

主干是historians began to investigate ……，宾语的结构是more of ……than
大意就是说历史学家们开始更多地研究前工业化欧洲的平民，而不再是那些由政治和社会精英组成的2-3%的人。其他的都是修饰补充成分

elfini

historians，。。。， began，。。。，to。。。