The impersonal phrase ‘fit ut‘ may be rendered in English as ‘it happens that…’ or ‘it comes about that…’ and takes a subjunctive clause in Latin. This ut-clause may be classed as one of result.
Recall that fit is the third person singular active indicative of fiō, which bears a complicated relationship to faciō, explained best by Mark Damen here. For more information on fiō, don’t bother with the Perseus edition of Lewis and Short. Even the advanced entry looks like this—
Here are a few examples of fit ut in action—
Fit ut hominēs causā nullā multa timeant: It (often) happens that men fear many things with little (good) reason.
Fit ut imbri crebrō certāmen differat: It is the case that, with the heavy rain, the match shall be cancelled.
The Essential A&G: 568n2, 569.2