Complex sentence: The most useful of the non-detergent soaps are those based on lithium, as they are free of corrosive propertienents of lithium soaps are lithium stearate and lithium 12-hydroxystearate.
Split into simpler sentences: The most useful of the non-detergent soaps are those based on lithium, as they are free of corrosive properties. The main components of lithium soaps are lithium stearate and lithium 12-hydroxystearate.