Complex sentence: After his death in 1793, there were still unpaid debts, which the creditors exchanged for annuities terminating in 1808, when his son Thomas Foley, 3rd Baron Foley had come of age.
Split into simpler sentences: After his death in 1793, there were still unpaid debts, which the creditors exchanged for annuities terminating in 1808. By that time, his son Thomas Foley, 3rd Baron Foley had come of age.