Complex sentence: On July 2,2005 Kato threw a perfect game against the Yakult Swallows in the second-tier Eastern League, which was the third perfect game in league history, following Masayuki Yamazaki in 1962 and Hiroshi Masumoto in 1987.
Split into simpler sentences: On July 2,2005 Kato threw a perfect game against the Yakult Swallows in the second-tier Eastern League. This was the third perfect game in the league's history, following Masayuki Yamazaki in 1962 and Hiroshi Masumoto in 1987.