56．In addition to having to be a generalist while specializing in whatmay seem to be a narrow field，the researcher is faced with the problem of primary materials thathave little or no documentation．

(what引导的从句作specializing in的宾语)

除了在专攻似乎是一个狭窄领域时不得不成为多面手以外，研究人员还面临着关于原始材料的文献很少或者根本没有这一问题。

分句1：in addition to…

分句2：what may seem …

分句3：the researcher is…

分句4：that has little…

1和2嵌套

1和3并列

3和4嵌套