Complex sentence: The primary source of income to the fund is fees paid to the Bureau of Ocean Energy Management, Regulation and Enforcement by companies drilling offshore for oil and gas, with additional minor sources including the sale of surplus federal real estate and taxes on motorboat fuel.
Split into simpler sentences: The primary source of income to the fund is fees paid to the Bureau of Ocean Energy Management, Regulation and Enforcement by companies drilling offshore for oil and gas. Additional minor sources of income include the sale of surplus federal real estate and taxes on motorboat fuel.