Complex sentence: See "The Great Theodolites" which had been intended for the East India Company and the purchase of this instrument on 21 June 1791 by the Board is taken as the inauguration of the Ordnance Survey.
Split into simpler sentences: See "The Great Theodolites" which had been intended for the East India Company. The purchase of this instrument on 21 June 1791 by the Board is taken as the inauguration of the Ordnance Survey.