Original: In 1763 he repaid money borrowed from the Lathrops, repurchased the family homestead that his father had sold when deeply in debt, and re-sold it a year later for a substantial profit.
Simplified: In 1763 he repaid money borrowed from the Lathrops, bought back the family homestead that his father had sold when deeply in debt, and re-sold it a year later for a substantial profit.