Complex sentence: Exacerbating the decline in production and exports has been the depressed world market for coffee; from February 1986 to August 1987, ICO indicator prices dropped by more than 20 percent.
Split into simpler sentences: Exacerbating the decline in production and exports has been the depressed world market for coffee. From February 1986 to August 1987, ICO indicator prices dropped by more than 20 percent.