Complex sentence: Kobellite (Pb 22 Cu 4 (Bi, Sb) 30 S 69) is a gray, fibrous, metallic mineral, a sulfide of antimony, bismuth, and lead.
Split into simpler sentences: Kobellite (Pb 22 Cu 4 (Bi, Sb) 30 S 69) is a gray, fibrous, metallic mineral. It is also a sulfide mineral consisting of antimony, bismuth, and lead.