insofar as
/ˌɪn.səʊˈfɑːr əz/conjunction
to the degree that; only to the extent that
постольку, поскольку; в той мере, в какой
Пишется слитно или раздельно: insofar as / in so far as. Звучит официально, в разговоре чаще говорят as far as.
“The plan worked insofar as nobody got hurt.”
“I’ll help you insofar as I can.”
“The report is useful insofar as it shows the main trends.”