a flight simulator that uses real-world wind speeds from a weather feed

How would the previous sentence be correctly capitalized?
Answer: A flight simulator that uses real-world wind speeds from a weather feed
the earth was populated by a third of all the angels! they were assigned to utilize the physical properties of earth to produce from the earth to enhance its beauty.

How would the previous sentence be correctly capitalized?
Answer: The earth was populated by a third of all the angels! They were assigned to utilize the physical properties of earth to produce from the earth to enhance its beauty.
many historians have used this as documentation to downplay the importance of darwin's participation on the voyage from a contemporary point of view.

How would the previous sentence be correctly capitalized?
Answer: Many historians have used this as documentation to downplay the importance of Darwin's participation on the voyage from a contemporary point of view.
for structured finance (i.e. often very complex financial products), information is required to be disclosed about the risk of the products.

How would the previous sentence be correctly capitalized?
Answer: For structured finance (i.e. often very complex financial products), information is required to be disclosed about the risk of the products.