He says that more openness in science could help to discourage what some perceive as a common practice of shutting out early-career scientists' requests for data.
请问这里what 引导的是什么从句?
宾语从句。这里的what很适合按照“缩/融合性关系代词”解释,即:what=the thing that,这样理解可能更直观更清晰。在这个网站里搜索“融合性关系代词”,可以了解更多的东西。