For example, the relevant currency exchange rate later than 5% a government or official authority substantially levies or increase in charges, or transportation costs increase substantially.

Начало вроде нормально, а дальше .....

Например, соответствующий курс иностранной валюты ...

Контекст: Tour cost and guarantee
We reserve the right to increase the price of the Tour in extreme circumstances only, between the date of issue of your Application form and departure. For example, the relevant currency exchange rate later than 5% a government or official authority substantially levies or increase in charges, or transportation costs increase substantially.
The cost of the tour is broken down into 1-3 payments (depending on how far advance of travel the booking is made); the first payments are used to cover all the associated costs with planning and running our tours.

Заранее спасибо