Complex sentence: Nineteenth century loggers used "skid roads" oxen to drag huge firs and smaller Tanbark oak ("Lithocarpus densiflorus ") trees along"skids" which were flat-topped logs doused with water to reduce friction.
Split into simpler sentences: Nineteenth century loggers used oxen to drag huge firs and smaller Tanbark oak ("Lithocarpus densiflorus ") trees along the trail."Skids" were flat-topped logs doused with water to reduce friction.