sentence: Roughly, 4 years later in the year 1805, Royal Arsenal came up with their first Congreve rocket only due to the Technology devised by Haider Ali and his son Tipu Sultan.
modified: fix grammar: Roughly, 4 year later in the years 1805, Royals Arsenals came up with their first Congreves rockets only due to the Technologys devised by Haiders Alis and his sons Tipus Sultans.