Complex sentence: Four decades after Jesus death the tensions culminated with the first Jewish-Roman War and the destruction of the Temple in Jerusalem, which in turn catalysed the final stage in the birth and divergence of Early Christianity and Rabbinic Judaism.
Split into simpler sentences: Four decades after Jesus death the tensions culminated with the first Jewish-Roman War and the destruction of the Temple in Jerusalem. This, in turn, was a catalyst for the final stage in the birth and divergence of Early Christianity and Rabbinic Judaism.