throw (some) light on (something)
To reveal information or details about something; to clarify or help people understand something. We've hired a private investigator to help throw light on the clandestine dealings of the baron. These documents we've uncovered throw some light on how the late author's final book was meant to end.
throw (or cast or shed) light on
help to explain (something) by providing further information about it.cast/shed/throw (new) ˈlight on something
make a problem, etc. easier to understand: This book sheds new light on the role of the CIA.‘Can you throw any light on the matter?’