Complex sentence: Sir William Pulteney, a British baronet and English land speculator, along with his partners in the Pulteney Association, purchased a 1,000,000 acres (4,000 km²) of the former Phelps and Gorham Purchase in 1790.
Split into simpler sentences: Sir William Pulteney, a British baronet and English land speculator. Pulteney and his partners in the Pulteney Association purchased a 1,000,000 acres (4,000 km²) of the former Phelps and Gorham Purchase in 1790.