Complex sentence: He had orders to arive at Yagu Gate on the 2nd of the 3rd lunar month so he arrived the next day at Fushun 100 li (里) away and set off from Fushun on the 1st of the 3rd lunar month.
Split into simpler sentences: He had orders to arrive at Yagu Gate on the 2nd of the 3rd lunar month, so he arrived the next day at Fushun, 100 li (里) away. He set off from Fushun on the 1st of the 3rd lunar month.