Original sentence: At Taylor's Shaft the National Trust has an Industrial Discovery Centre which incorporates several buildings dating from the 1920s, including the engine house still containing the 90 inch Harvey's Engine, which was saved through a donation from an American benefactor.By 1843 the mine was employing 300 people and its deepest workings were 90 fathoms (540 feet) deep.For much of its long life it was a very rich mine that did not close finally until 1945.In 1921 there was a large rockfall underground which destroyed both of the mine's winding shafts, and caused flooding, so the next year a new shaft, called Taylor's Shaft after the mine manager, was started.The unique 110 foot tall chimney stack bearing the vertical letters "EPAL" in white bricks near the top was completed before the engine house was built.There were many lodes on the sett, all crossed by several elvan dykes.This first profitable period lasted for ten years during which time a total of £32,256 dividends were paid on the 128 shares that had so far cost their owners a mere £5 each
Edited sentence: At Taylor's Shaft the National Trust has an Industrial Discovery Centre which incorporates several buildings dating from the 1920s.By 1843 the mine was employing 300 people and its deepest workings were at 90 fathoms (540 feet).In 1921 there was a large rockfall underground which destroyed both of the mine's winding shafts, and caused flooding, so the next year a new shaft, named Taylor's Shaft after the mine manager, was started.One of these is the engine house still containing the 90 inch Harvey's Engine, which was saved through a donation from an American benefactor.The 110 foot tall chimney stack for this engine's boilers was completed before the engine house was built.The many lodes on the sett are all crossed by several elvan dykes.The unique feature of this stack, the vertical letters "EPAL" displayed in white bricks near the top, is still visible.This first profitable period lasted for ten years during which time a total of £32,256 dividends were paid on the 128 shares that had cost their owners a mere £5 each.Worked from the early 18th century until 1945, first for copper and later tin, it was very profitable for much of its life