Complex sentence: In 1890, Gamble founded the Forest School Herbarium (renamed the Dehra Dun Herbarium in 1908), but is probably best remembered for his authorship of "A Manual of Indian Timbers".
Split into simpler sentences: In 1890, Gamble founded the Forest School Herbarium (renamed the Dehra Dun Herbarium in 1908). He is probably best remembered for his authorship of "A Manual of Indian Timbers".