Complex sentence: Robert Troup, Thomas L. Ogden, and Benjamin W. Rogers--obtained the proprietary and preemptive rights from Massachusetts and executed a treaty of conveyance with the Seneca on August 31,1826, purchasing 87,000 acres for $48,216.
Split into simpler sentences: Robert Troup, Thomas L. Ogden, and Benjamin W. Rogers--obtained the proprietary and preemptive rights from Massachusetts. They executed a treaty of conveyance with the Seneca on August 31,1826, purchasing 87,000 acres for $48,216.