Complex sentence: Season 19 champion Alfonso Ribeiro filled in for Tom Bergeron on October 5,2015, when Bergeron went to be with his ailing father, Raymond Bergeron, who subsequently died on October 12,2015.
Split into simpler sentences: Season 19 champion Alfonso Ribeiro filled in for Tom Bergeron on October 5,2015, when Bergeron went to be with his ailing father. Bergeron's father, Raymond Bergeron, passed away from an illness on October 12,2015.