Complex sentence: He owned the Dixon Hotel in Kansas City, where his billiard parlor won him national recognition; during his baseball career, he had begun mentoring his nephew, Bennie Allen, and as the years passed, Bennie went on to become a champion too.
Split into simpler sentences: He owned the Dixon Hotel in Kansas City, where his billiard parlor gained national recognition. During his baseball career, he had begun mentoring his nephew, Bennie Allen, and as the years passed, Bennie went on to become a champion too.