Terms for subject Mathematics containing it was not until... that

English	Russian
it was not until fairly recently that	относительно недавно
it was not until fairly recently that much attention was directed to the calculation of	лишь относительно недавно основное внимание было направлено на вычисление
it was not until 1970 that	только в 1970 г
it was not until the internal combustion engine had been well developed that propulsion of lighter-than-air aircraft became feasible	только после того как
it was not until 10 years later that	только через 10 лет