an artist who is simply tired -- 
(ROOT (NP (NP (DT an) (NN artist)) (SBAR (WHNP (WP who)) (S (VP (VBZ is) (ADVP (RB simply)) (ADJP (JJ tired))))) (: --)))
(ROOT (NP (NP (DT ) (NN )) (SBAR (WHNP (WP )) (S (VP (VBZ ) (ADVP (RB )) (ADJP (JJ ))))) (: )))