In so far as

I am a foreign English learner, and I cannot quite understanding the meaning of the following sentence,
especially the phrase in bracket, can any one help me, thanks.

Text:

Just as much as any other historian, an archaeologist studies and tries to reconstitute the process that has created the human world in which we live - and us ourselves (in so far as) we are each creatures of our age and social environment.

Merriam-Webster Online:

Main Entry: insofar as
Function: conjunction

to the extent or degree that