How to understand "with which facts" in this sentence?

Paraphrase:

Facts like these are known but they need to be known more accurately and have a greater scope because they occupy a significant fraction of the literature of experimental and observational science".

Attempts to increase the accuracy and scope – Noun phrase = Subject

with which (i.e. referering to the accuracy and scope of) facts like these are known – adjectival clause modifying “the accuracy and scope”

occupy – finite verb

a significant fraction of the literature of experimental and observational science" – Noun phrase = Object

With which it is verbed - Compare: This is the soup and this is the spoon with which it is stirred.