Complex sentence: His account of his visit to China was an important source for the account of John Mandeville; many of the incredible reports in Mandeville have proven to be garbled versions of Odoric's eyewitness descriptions.
Split into simpler sentences: His account of his visit to China was an important source for the account of John Mandeville. Many of the incredible reports in Mandeville have proven to be garbled versions of Odoric's eyewitness descriptions.