Complex sentence: Grain production in China peaked in 1998 with 392 million tons, but it fell below 350 million tons in 2000,2001, and 2002 and has been falling since.
Split into simpler sentences: Grain production in China peaked in 1998 with 392 million tons. But it fell below 350 million tons in 2000,2001, and 2002 and has been falling since.