Complex sentence: On another disastrous night at a casino he lost £10,000, that time his stockbroker uncle, John Bevan, helped him repay the debt (Lucan repaid his uncle two years later).
Split into simpler sentences: On another disastrous night at a casino he lost £10,000. That time his stockbroker uncle, John Bevan, helped him repay the debt (Lucan repaid his uncle two years later).