Complex sentence: There is concern that engineered carbon nanoparticles, when manufactured on an industrial scale, could pose a dust explosion hazard, especially for processes such as mixing, grinding, drilling, sanding, and cleaning.
Split into simpler sentences: There is concern that engineered carbon nanoparticles, when manufactured on an industrial scale, could pose a dust explosion hazard. Explosion hazards may exist for processes such as mixing, grinding, drilling, sanding, and cleaning.