Complex sentence: In late 2010, Buckles was still giving media interviews and became an unverified supercentenarian upon his claimed 110th birthday, on February 1,2011.Eventually at least one document supporting his age was been validated, but not the three required by GRG.
Split into simpler sentences: In late 2010, Buckles was still giving media interviews and became a supercentenarian upon his 110th birthday, on February 1,2011. At least one document supporting his age has been validated, but not the three required by GRG.