Complex sentence: Dunnage is an inexpensive or waste material used to load and secure cargo during transportation, or support jacks, pipes, and supports for air conditioning and other equipment above the roof of a building.
Split into simpler sentences: Dunnage is an inexpensive or waste material used to load and secure cargo during transportation. Dunnage may also be material used to support jacks, pipes, and supports for air conditioning and other equipment above the roof of a building.