Complex sentence: It flows 700km before joining the Indus River in Pakistan, passing Kabul, Chaharbagh, Jalalabad, and (flowing into Pakistan some 30 km north of the Khyber Pass) Nowshera.
Split into simpler sentences: It flows 700km before joining the Indus River in Pakistan. It passess through the cities of Kabul, Chaharbagh, Jalalabad, and (flowing into Pakistan some 30 km north of the Khyber Pass) Nowshera.