Complex sentence: In 1985, Keene received £1,178 from the BCF for being Tony Miles'second at the Interzonal in Tunis; however, he had not actually been Miles' second but accepted the money and shared it with Miles.
Split into simpler sentences: In 1985, Keene received £1,178 from the BCF for being Tony Miles's second at the Interzonal in Tunis. However, he had not actually been Miles' second but nevertheless accepted the money and shared it with Miles.