Complex sentence: After his death Uvedale's growing plants were mostly sold to Sir Robert Walpole for his collection at Houghton Hall his herbarium, in fourteen thick volumes, forms vols.302--15 of the Sloane collection.
Split into simpler sentences: After his death Uvedale's growing plants were mostly sold to Sir Robert Walpole for his collection at Houghton Hall. His herbarium, in fourteen thick volumes, forms vols.302--15 of the Sloane collection.