Complex sentence: He made his debut in the top makuuchi division in July 1984, and in the following tournament in September he defeated two yokozuna, Chiyonofuji and Takanosato, and was runner-up with a 12--3 record.
Split into simpler sentences: He made his debut in the top makuuchi division in July 1984. In the following tournament in September 1984 Konishiki defeated two yokozuna and was runner-up with a 12--3 record.