Answer :
The sentence can be made more concise by simplifying 'In the event that' to 'If' and saying 'seek shelter in a windowless room,' making the sentence both shorter and clearer.
The sentence 'In the event that you spy a tornado, go and seek shelter in a dark room that has no windows' can be made more concise by identifying and eliminating unnecessary words and phrases without changing its meaning. The phrase 'In the event that' can be simplified to 'If' to reduce wordiness.
Furthermore, the direction can be streamlined to 'seek shelter in a windowless room.' This removes the redundant description since dark rooms are often implied to have no windows in the context of seeking shelter from a tornado.
By applying these changes, the revised sentence becomes 'If you see a tornado, seek shelter in a windowless room.' This concise version retains the original information but in a more direct and clear manner.