Complex sentence: Deontay Leshun Wilder (born October 22,1985) is an American WBC heavyweight title since 2015, and in doing so became the first American world heavyweight champion in nine years, which was the longest period of time in boxing history without an American heavyweight champion.
Split into simpler sentences: Deontay Leshun Wilder (born October 22,1985) is an American professional boxer. He has held the WBC heavyweight title since 2015, and in doing so became the first American world heavyweight champion in nine years, which was the longest period of time in boxing history without an American heavyweight champion.