Complex sentence: 'Lehigh Coal & Navigation Company' was created by the merger of the Lehigh Coal Mining Company, tasked with developing the mine and building the haul road to the river, and the Lehigh Navigation Company, tasked with developing the waterway into a navigable canal.
Split into simpler sentences: 'Lehigh Coal & Navigation Company' was created by the merger of the Lehigh Coal Mining Company and the Lehigh Navigation Company. It was tasked with developing the mine, building the haul road to the river, and developing the waterway into a navigable canal.