Complex sentence: Volume 1 -1915 Nine years later he relocated to Santa Barbara to teach natural history at the Cate School for Boys where he became a mentor to the American botanist G. Ledyard Stebbins.
Split into simpler sentences: Volume 1 -1915 Nine years later he relocated to Santa Barbara to teach natural history at the Cate School for Boys. There he became a mentor to the American botanist G. Ledyard Stebbins.