Complex sentence: While sitting on a dock waiting for his truck to be unloaded onto a ship, he was watching other trucks being unloaded.every crate on every truck had to be unloaded, put in a sling and hoisted up and then down into the hold of the ship.
Split into simpler sentences: While sitting on a dock waiting for his truck to be unloaded onto a ship, he was watching other trucks being unloaded. Every crate on every truck had to be unloaded, put in a sling and hoisted up and then down into the hold of the ship.