Complex sentence: He was born in San Francisco and founded the stockbrokers Greene and Co. there but spent the last 43 years of his life in Monterey, California where he was an influential figure in the development of the city and the preservation of its historical landmarks.
Split into simpler sentences: He was born in San Francisco and founded the stockbrokers Greene and Co. there but spent the last 43 years of his life in Monterey, California. He became an influential figure in the development of the Monterey and the preservation of its historical landmarks.