Complex sentence: OTF knives may be further subdivided into manual sliding knives, which are not restricted as inertia knives, and automatic OTF switchblade knives and gravity knives, which are restricted offensive weapons.
Split into simpler sentences: OTF knives may be further subdivided into manual sliding knives which are not restricted as inertia knives. Or automatic OTF switchblade knives, and gravity knives, both restricted offensive weapons.