Complex sentence: It is 90 km long and connects Islamabad with Murree, continuing on to eventually become the Kohala-Muzaffarabad Road linking the twin cities and Murree with Muzaffarabad.
Split into simpler sentences: It is 90 km long and connects Islamabad with Murree. It continues on to eventually become the Kohala-Muzaffarabad Road linking the twin cities and Murree with Muzaffarabad.