Complex sentence: These books were mostly produced within the Western Xia state (1038--1227) during the 12th and 13th centuries, and include Buddhist sutras and explanatory texts, dictionaries and other philological texts, and translations of Chinese books.
Split into simpler sentences: These books were mostly produced within the Western Xia state during the 12th and 13th centuries. Tangut books include Buddhist sutras and explanatory texts, dictionaries and other philological texts, and translations of Chinese books.