Complex sentence: In 1813, Brewster observed the simple concentric pattern in "beryl, emerald, ruby & c." The same pattern was later observed in calcite by Wollaston, Biot, and Seebeck.
Split into simpler sentences: In 1813, Brewster observed the simple concentric pattern in beryl, emerald, and ruby. It was later observed in calcite by Wollaston, Biot, and Seebeck.