Excursus: Prophecies fulfilled Near and Far

The Bible is not unclear and prophecy matters. Why is prophecy so difficult to understand and interpret?
If there is a near term fulfillment and a far term fulfillment what does this mean and are there examples in Scripture where this is obvious? How can we know the difference?

1. 6 reasons why prophecy is difficult.
2. Near and far fulfillment.
3. The difference