In addition to having to be a generalist while specializing in what may seem to be a narrow field，the researcher is faced with the problem of primary materials that have 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
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