Complex sentence: It was purchased in December 1792 and February and July 1793 from Robert Morris who had purchased it from Massachusetts in May 1791, after Phelps and Gorham failed to extinguish Indian title to this tract and had defaulted on payment in 1790.
Split into simpler sentences: It was purchased in December 1792 and February and July 1793 from Robert Morris. Elizabeth M. Nuxoll, "Congress and the Munitions Merchants" (1985) Morris had purchased it from Massachusetts in May 1791, after Phelps and Gorham failed to extinguish Indian title to this tract and had defaulted on payment in 1790.