Complex sentence: The river Indus was an important artery of communication between Karachi and Jhirk Near Kotri Sindh, was an important river port, the Indus flotilla used large quantities of firewood and it was kept to fuel steamboats.
Split into simpler sentences: The river Indus was an important artery of communication between Karachi and Jhirk Near Kotri Sindh, was an important river port. The Indus flotilla used large quantities of firewood and it was kept to fuel steamboats.