Complex sentence: On June 4,1981, he beat Ken Bogner by a knockout in seven, but later that year, on August 31, he lost for the first time, outpointed over eight rounds by Anthony Fletcher.
Split into simpler sentences: On June 4,1981, Bramble beat Ken Bogner by a knockout in seven rounds. But later that year, on August 31, he lost for the first time, in an eight round decision to Anthony Fletcher.