Valid for 2 persons at least one of whom is 55 years old Price for stay in own caravan excluding electricity DKK 35 per day These specials are not available in the period 97

Can you repeat this sentence, but add in punctuation?
Valid for 2 persons, at least one of whom is 55 years old. Price for stay in own caravan excluding electricity DKK 35 per day. These specials are not available in the period 9.7.