Translation
For then there would be
Go to footnote numbergreat suffering, such as has not been from the beginning of the world till now, nor never shall be.
Paraphrase
For in that case there would be a trifecta of misery-causing forces (ruthless men, nature, and religious obligations) causing greater suffering than anything you have ever heard of, and worse than anything to come in the future.
Footnotes
1: “there would be”
The verb used here is a future verb form and is therefore translated “will be” by most translators. However, the future tense can sometimes express uncertainty since the future, by nature, is uncertain. The uncertainty is clearly indicated in the previous verse by the words “Pray that your flight not be …” and confirmed by the fact that the event did not happen in winter or on the Sabbath. Thus “there would be” is justified in this context.