Complex sentence: By the early 1880s, Rosenberg lived in San Francisco, California, where he was a well-known figure, regarded as an eccentric, an "adventurer", and a "curio".
Split into simpler sentences: By the early 1880s, Rosenberg lived in San Francisco, California, where he was a well-known figure. He was regarded as an eccentric, an "adventurer", and a "curio".