Improve the grammaticality of this sentence: It is apparent that eventually nuclear energy will be significantly cheaper even in regions that are rich in fossil fuels.
The main reason for the increase in the price of oil is the fact that the price of oil has fallen by 10% in the last 10 years.
The reason for this is that the price of oil has fallen by 10% in the last 10 years.
The reason for this is that the price of oil has fallen by 10% in the last 10 years.
The reason for this is that the price of oil has fallen by
The first sentence is a bit more complicated. The first sentence is a bit more complicated. The second sentence is a bit more complicated. The third sentence is a bit more complicated.

• I think the first sentence is a bit more complicated than the second. The second sentence is a bit more complicated than the first sentence. – user163952 Jun 16 '17 at 19:23
• @user163952 I