Complex sentence: Weeks later, when his conquest was extended to Patan, both Jaya Prakash Malla and the King of Patan, Tej Narsingh Malla, fled again, taking refuge in Bhaktapur, which was also conquered by Prithvi Narayan Shah after some time.
Split into simpler sentences: Weeks later, when his conquest was extended to Patan, both Jaya Prakash Malla and the King of Patan, Tej Narsingh Malla, fled again, taking refuge in Bhaktapur. Bhaktapur was also conquered by Prithvi Narayan Shah after some time.