Complex sentence: He wrote an extensive amount of information on Darius which spans half of book 3, along with books 4,5 and 6; it begins with removal of the alleged usurper Gaumata and continues to the end of Darius's reign.
Split into simpler sentences: He wrote an extensive amount of information on Darius which spans half of book 3, along with books 4,5 and 6. It begins with the removal of the alleged usurper Gaumata and continues to the end of Darius's reign.