, as blood work proves , that was a long , long time ago . 
(ROOT (S (, ,) (SBAR (IN as) (S (NP (NN blood) (NN work)) (VP (VBZ proves)))) (, ,) (NP (DT that)) (VP (VBD was) (PP (NP (DT a) (JJ long) (, ,) (JJ long) (NN time)) (RB ago))) (. .)))
(ROOT (S (, ) (SBAR (IN ) (S (NP (NN ) (NN )) (VP (VBZ )))) (, ) (NP (DT )) (VP (VBD ) (PP (NP (DT ) (JJ ) (, ) (JJ ) (NN )) (RB ))) (. )))