The phrase "and so it was that" is correct and usable in written English. You can use it to connect two sentences together to show that one happened as a result of the other. For example, "The sun was setting quickly, and so it was that the group soon found themselves in the dark.".
Anyone who progresses that far that fast is bound to attract suspicion, and so it was that Ledecky found herself answering a question about performance-enhancing drugs.
Twice that many were needed, and so it was that New Zealand qualified through superior goal difference.
They can't hurt what they can't hit, after all, and so it was that ideas like Bittorrent and others arose.
And so it was that moment when I realised the world needed to change".
And so it was that prime minister Gordon Brown had to go to America for a good gig.
And so it was that emoji enjoyed tremendous popularity, but only in Japan, and only within the walled gardens of each cellular provider's phones.
And so it was that the fall-winter show found its fashion talisman.
When I feel like I can't trust my brain 100%, Ludwig really comes in handy. It makes me translate and proofread faster and my output more reliable.
Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu