Complex sentence: Another ~ 51 short-lived nuclides can be detected naturally as daughters of longer-lived nuclides or cosmic-ray products, and the remaining known nuclides are known solely from artificial nuclear transmutation.
Split into simpler sentences: Another ~ 51 short-lived nuclides can be detected naturally as daughters of longer-lived nuclides or cosmic-ray products. The remaining known nuclides are known solely from artificial nuclear transmutation.