Complex sentence: By July 1822 there was so much demand for Poyaisian land at 2s/3d per acre that MacGregor's advertisements announced the raising of the price to 2s/6; before long the price for an acre in Poyais was 4s/-.
Split into simpler sentences: By July 1822 there was so much demand for Poyaisian land at 2s/3d per acre that MacGregor's advertisements announced the raising of the price to 2s/6. Before long the price for an acre in Poyais was 4s/-.