Original: Salt licks Porcupines in search of salt sometimes encroach on human habitats, eating plywood cured with sodium nitrate,  certain paints, and tool handles, footwear, clothes and other items that have been coated in salty sweat.
Simplified: Porcupines in search of salt sometimes live in human places, eating plywood cured with sodium nitrate,  certain paints, and tool handles, footwear, clothes and other items that have been coated in salty sweat.