Complex sentence: In spite of this repetition of earlier (and sometimes fanciful) information, the Weilüe contains new, unique, and generally trustworthy material, mostly from the late second and early third centuries CE. It is this new information that makes the Weilüe a valuable source.
Split into simpler sentences: In spite of this repetition of earlier (and sometimes fanciful) information, the Weilüe contains new, unique, and generally trustworthy material. Most of it dates from the late second and early third centuries CE. It is this new information that makes the Weilue such a valuable source.