which become strangely impersonal and abstract 
(ROOT (SBAR (WHNP (WDT which)) (S (VP (VBP become) (ADJP (RB strangely) (JJ impersonal) (CC and) (JJ abstract))))))
(ROOT (SBAR (WHNP (WDT )) (S (VP (VBP ) (ADJP (RB ) (JJ ) (CC ) (JJ ))))))