Complex sentence: Many of the details in Polo's accounts have been verified; for example, when visiting Zhenjiang in Jiangsu, China, Marco Polo noted that a large number of Christian churches had been built there.
Split into simpler sentences: Many of the details in Polo's accounts have been verified. For example, when visiting Zhenjiang in Jiangsu, China, Marco Polo noted that a large number of Christian churches had been built there.