Complex sentence: It was written in 1640 CE, around ninety years after the death of Sisudachan, by Dutch merchant Jeremias Van Vliet, who stayed in Ayutthaya for nine years from 1633--1642 CE during the reign of King Prasat Thong.
Split into simpler sentences: It was written in 1640 CE, around ninety years after the death of Sisudachan. Its author is Jeremias Van Vliet, a Dutch merchant who stayed in Ayutthaya for nine years from 1633--1642 CE during the reign of King Prasat Thong.