Complex sentence: Owing to its many tourist attractions, much of Dongcheng's economy is in the service sector, which in 2001 accounted for 88% of the district's share of China's gross domestic product.
Split into simpler sentences: Owing to its many tourist attractions, much of Dongcheng's economy is service-oriented. As of 2001, that sector accounted for 88% of the district's share of China's gross domestic product.