irrelevant as on the engaging , which gradually turns what 
(ROOT (ADJP (JJ irrelevant) (PP (IN as) (PP (IN on) (NP (NP (DT the) (NN engaging)) (, ,) (SBAR (WHNP (WDT which)) (S (ADVP (RB gradually)) (VP (VBZ turns) (SBAR (WHNP (WP what)))))))))))
(ROOT (ADJP (JJ ) (PP (IN ) (PP (IN ) (NP (NP (DT ) (NN )) (, ) (SBAR (WHNP (WDT )) (S (ADVP (RB )) (VP (VBZ ) (SBAR (WHNP (WP )))))))))))