Complex sentence: Safety concerns are two part, one being fine dust and chemicals released when particleboard is machined (e.g., sawing or routing), and occupational exposure limits exist in many countries recognizing the hazard of wood dusts.
Split into simpler sentences: Safety concerns are two part, one being fine dust and chemicals released when particleboard is machined (e.g., sawing or routing). Occupational exposure limits exist in many countries recognizing the hazard of wood dusts.