Complex sentence: On March 25,2014, Nabors announced that the 2014 "500" would be his final appearance singing "Indiana" at the Indianapolis Motor Speedway, explaining that his health was limiting his ability to travel.
Split into simpler sentences: On March 25,2014, Nabors announced that the 2014 "500" would be his final appearance singing "Indiana" at the Indianapolis Motor Speedway. Nabors stated that his health was limiting his ability to travel.