Use insofar to mean "as much" or "to the extent." You might, for example, say, "I will get my math homework done insofar as I can. The adverb insofar is somewhat old fashioned and uncommon these days, but it's a good way to talk about doing something to a certain degree or extent.

What does insofar mean?

: to such extent or degree.

Is insofar always followed by AS?

Insofar as is used to introduce a quantifiable fact and is followed by a consequence which depends on the extent to which the fact applies. Insofar as I have understood their proposal, I am against it.